H-BAU ISOMUR® Wall Foot Elements

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ISOMUR速 wall base element for efficient insulation of the building foundation

ISOMUR速 on a secure footing

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H-Bau Technik GmbH Contact

Paul Rieger: Tel. +49 (0) 77 42 / 92 15-21 Fax +49 (0) 77 42 / 92 15-93 Mobil +49 (0) 171 / 864 72 61 eMail: paul.rieger@h-bau.de Oliver Etzrodt Tel. +49 (0) 70 82 / 41 39 63 Fax +49 (0) 70 82 / 79 33 00 Mobil +49 (0) 171 / 864 72 60 eMail: oliver.etzrodt@h-bau.de

H-Bau Technik GmbH Head Office: Am G端terbahnhof 20 79771 Klettgau Germany Tel. +49 (0) 77 42 / 92 15-20 Fax +49 (0) 77 42 / 92 15-90 eMail: export.klettgau@h-bau.de

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Production North-East: Brandenburger Allee 14641 Nauen-Wachow Germany Tel. +49 (0) 332 39 / 775-20 Fax +49 (0) 332 39 / 775-90 eMail: export.berlin@h-bau.de

Rudolf Till Tel. +49 (0) 332 39 / 775-24 Fax +49 (0) 332 39 / 775-90 Mobil +49 (0) 172 / 993 70 50 eMail: rudi.till@t-online.de

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Wall base elements

Contents ISOMUR®

Wall base elements Thermal insulation and moisture proofing

4-7

Energy saving – a health risk?

4

Efficient insulation of the building foundation

5

Comparison of insulation measures

6

Building material moisture content and thermal insulation

7

Fire protection and sound insulation

8

Fire protection

8

Sound insulation

8

Energy Saving Ordinance (EnEV)

8-9

Thermo-technical characteristic data

10

Static measurements

11

Wall base design

12

Installation instructions

13

References

14

Recommendations for tenders

15

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ISOMUR® - on a secure footing

ISOMUR Ž Thermal insulation and moisture proofing Energy saving – a health risk?

The better the thermal insulation of the building shell is, the more delicate the thermal bridges.

Present day thermal insulation regulations such as the Energy Saving Ordinance (EnEV) in the case of new buildings with thermal insulation composite systems or double-leaf masonry result in insulation thicknesses of 120

mm or more. External wall and roof constructions are easily adapted.

However, thermal bridges are always more problematic due to the ever-improving insulation of the building shell.

This circumstance is confirmed by the fact that fungal attack is a topic to be treated seriously even in new buildings and constructors and building

experts are confronted increasingly with this set of problems. If, in addition to the actual energy-saving measures, no accompanying measures are taken in regard to thermal bridges, the risk of fungal attack increases.

As a result, the one-sided saving of energy can become a health risk.

Altenaria fungi

Images of damage that are a thing of the past when Isomur plus is installed.

The building foundation is a central weak spot.

Non-insulated building foundation Where there is no insulation of the building foundation, the rising masonry work interrupts the thermal insulation shell of the building between the exterior wall insulation and the thermal insulation over the basement floor.

This means: Increased risk of fungal attack from locally increased relative air humidity as a result of a lower surface temperature in the area of the wall base.

Thermal loss

Insulated building foundation Isomur plus closes the gap in the thermal insulation between the exterior wall insulation and the insulation over the basement floor.

This means: A healthy interior climate The risk of fungal formation is mitigated Minimum thermal loss

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Thermal insulation and moisture proofing Efficient insulation of the building foundation The Isomur plus element is conceived for application in all residential building masonry work and complies with masonry strength class 20.

The use of Isomur plus mitigates the risk of moisture damage internally in the form of discolouration and fungal formations.

The requirements on load-bearing capacity and serviceability are entirely fulfilled under practical conditions.

Isomur plus solves the problem of thermal bridges on wall bases: The element is non-absorptive and therefore the thermal insulation is not impaired by the moisture arising during the construction phase.

The element has thermal insulation properties which mitigate definitively the thermal bridges.

The installation of the element is simple and problem-free and therefore the flawless quality is not dependent on awkward on-site measures.

Walling up as the lowest layer in the masonry work

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ISOMUR速 - on a secure footing

ISOMUR ® Thermal insulation and moisture proofing Comparison of insulation measures Building foundation with no special measures For building foundations with no special measures the rising masonry work interrupts the thermal insulation shell of the building between the exterior wall insulation and the insulation over the basement floor.

Thus in connection with the high thermal conductivity of the building bricks in the vertical direction (λ ≈ 1.0 W/mK) a massive thermal bridge forms on the building foundation.

This means: Decline in the internal surface temperature with the resulting risk of discolouration, fungus formation and egress of condensation water Increased thermal loss resulting in increased heating costs

+ 20°C

- 10°C

Thermal insulation effect 0%

+10°C Building foundation with no special measures

Constructional insulation measures In order to mitigate the thermal bridges in the building foundation, the exterior wall insulation in the form of perimeter insulation is often continued into the ground. In addition to the not insignificant costs of this measure, the achievable insulation effect is therefore also limited.

In particular, by pulling the perimeter insulation further down, no additional increase in insulation effect is achieved from a depth of approx. 0.5 m

Thermal insulation effect ≤45%

Constructional insulation measures

Insulating with Isomur plus The load-bearing thermal insulation element Isomur plus closes the gap in the thermal insulation between the exterior wall insulation and the insulation over the basement floor. This produces a continuous, highly efficient, thermal insulation.

This means: Increase of the interior surface temperature considerably above the critical dew-point temperature Mitigation of the risk of fungal formation and egress of condensation water Healthy interior climate Minimised thermal loss and thus cost savings on heating

Thermal insulation effect 70%

Insulating with using Isomur plus

Theoretical ideally-insulated building foundation In order to compare the thermal insulation effect of the constructions described above, the theoretical ideal case of a completely closed thermal insulation layer is defined as a benchmark. However, for structural reasons this measure is not realisable in practice.

6

Thermal insulation effect 100%

Theoretical ideally-insulated building foundation

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Thermal insulation and moisture proofing Building material moisture content and thermal insulation Thermal insulation effect and humidity The thermal conductivity is a characteristic value of the raw material which is influenced significantly by the moisture content of the building material. The higher the absorptive capacity of a building material, the greater the negative influence on the thermal insulation effect. Therefore, the selection of a building material to be used in a damp environment is of decisive importance.

Dependency of the thermal conductivity on the building material moisture content taking aerated concrete and Isomur plus as the example [7], [10]

Declared values and real conditions In the saturated condition absorptive building bricks have a considerably higher thermal conductivity than the λ values specified in the data sheets. The thermal conductivity increases by approx. 0.28 W/mK for each 10% by volume moisture content. Thus for aerated concrete for example, the absorbable amount of water is up to 45% by volume. For an installation humidity of 25% by volume, the thermal conductivity is therefore approx. 0.9 W/mK. For a wall base, humidity can be assumed fundamentally, whether it is in the form of standing water on the floor of the building shell or introduced with the floating floor screed, to name but two factors.

Time characteristic for building dry-out The moisture absorbed by the wall base during the construction phase can only be released again very slowly due to the all-round “packing” of the first layer of bricks. Using FEM simulation, the Fraunhofer Institut für Bauphysik [Building Physics] determined that the actual thermal conductivity of absorptive bricks is significantly higher than the specified λ value not only during the construction phase but also during the total, multi-year drying-out period of a new building.

The solution: moisture-resistant building elements Isomur plus elements exhibit such low water absorption that when used as a first layer of bricks they are effectively a barrier layer. Thus the thermal insulation is guaranteed from the start without the need for costly measures on-site.

Moisture content during the drying-out period taking absorbtive insulating bricks and Isomur plus as the example

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ISOMUR® - on a secure footing

ISOMUR 速 Fire protection and sound insulation Fire protection Fire protection requirements The fire protection requirements relating to building walls are determined by the respective Federal State Building Regulations.The fire protection requirements relating to supporting walls of non-detached, residential, low-height buildings (i.e. the highest floor level is nowhere more than 7 m above ground level) are at least F30-B according to Model Building Code. In a specific case the provisions in the applicable Federal State Building Regulations must be observed.

Fire-resistance ratings F30 and F90 When using Isomur plus the classification of space-enclosing and non-space-enclosing walls into the fire-resistance ratings F30 and F90 in accordance with DIN 4102, part 2 or part 4 remains in existence if the installation is carried out as follows: Install the element within the floor construction such that the upper edge of the element lies below the upper edge of the floor screed.

The designation of the masonry walls with Isomur plus is then F30-AB or F90-AB in accordance with DIN 4102, part 2. [8] [9]

Iso m ur p l us i s b e low th e up p e r e d g e o f t h e f l o or screed u p p e r edge o f f l o or screed

Firewalls As a general rule Isomur plus may not be used in firewalls.

Therefore, approval for an individual, specific case is required.

F30 or F90 fire protection rating for space enclosure

Sound insulation Installing Isomur plus does not affect the sound insulation properties of the wall.

Energy Saving Ordinance (EnEV) The Energy Saving Ordinance has been in force since 1.02.2002 and defines the mandatory energy standards for new buildings. The methods of calculation in accordance with EnEV take into account, for the first time numerically, the effect of thermal bridges when calculating the heat transfer loss. The effect of the thermal bridges plays a big part in particular for buildings with high thermal standards.

Percentage shares of heat transfer loss of a low-energy house [5]

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Th er m a l b rid ges 13 % Exterior walls 31 % Windows 32 % 11 %

1 3% Ro o f ar ea s

low e r bui l di n g com p let i o n

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Energy Saving Ordinance (EnEV) The designer is offered three possibilities for quantitative determination of the effect of thermal bridges: 1. No proof of thermal bridges The heat transfer coefficient is increased by ∆UWB = 0.10W/(m2K) for the total thermally-conductive surface area.

2. Thermal bridge proof in accordance with DIN 4108, Supplementary Sheet 2 For construction details corresponding to the design examples in accordance with DIN 4108, Supplementary Sheet 2, an increase in the heat transfer coefficient for the total thermally-conductive surface area by ∆UWB = 0.05W/(m2K) can be expected.

3. More precise proof of thermal bridges For proof of thermal bridges in accordance with DIN 4108-6 in conjunction with DIN EN ISO 10211-1 and DIN EN ISO 12211-2, the effective thermal bridge loss coefficients ψa can be taken into account.

1. No proof of thermal bridges

2. Thermal bridge proof in accordance with DIN 4108, Supp. 3

3. More precise proof of thermal bridges

Thermal bridge details according to Material and geometrical conforthermal bridge catalogue or calculamance with design examples tion

Description

No proof

Thermal bridge correction factor

0.10

0.05

Not all-inclusive/ individual thermal bridges determined

Heat transfer loss HT (W/K)

Σ Fi Ui Ai + 0.10 Atotal

Σ Fi Ui Ai + 0.05 Atotal

Σ Fi Ui Ai + Σ Fi ψi li

Moisture proofing

Risk of mould fungus from condensation water egress

Moisture proofing fulfilled in accordance with the standard

Precise analysis of the moisture-related quality

Calculation example for single-family dwelling [6] Thermal bridge correction factor ∆UWB (W/m2K) resp. Ψa (W/mK)

0.10

0.05

- 0.01

Decline in the U-value

≥31%

≥15%

~ 0%

Surface temperature in the internal corner of the exterior wall

No data – risk of fungal attack

No data – not critical according to 15.9°C DIN 4108 Suppl. Sheet 2 Moisture proofing optimally solved

The calculated ψ values for conventional interior and exterior wall constructions are listed on page 10 of this brochure.

Using these values the exact proof of the thermal bridges (variant 3) can be made.

Note on the thermal bridge loss coefficients ψa: According to EnEV the thermal losses of the heat-exchanging external construction elements are determined across the external dimensions. However, this results in, e.g. for external corners, the product of the heat-ex-

changing surface and its U-value being too high, as this turns out to be much too high compared with the internal, dimensions-related and actual, heat-exchanging surface and additional consideration of the thermal

bridge. For this reason when determining the ψa values negative numbers can materialise which lead to a reduction in the losses calculated allinclusively over the external dimensions.

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ISOMUR® - on a secure footing

ISOMUR ® Thermo-technical characteristic data The following thermal bridge loss coefficients, temperature factors and minimum surface temperatures result due to the thermo-technical characteristic values of Isomur plus and sand-lime masonry.

Isomur plus Type 20-11.5 20-15 20-17.5 20-20 20-24

Thermal conductivity (W/mK)4)

0.245

Thermal insulation composite systems Insulation Isomur plus Ψ a (W/mK) (cm) Type

fRsi —

1)

16 14 12 10

20-15 20-17.5 20-20 20-24

ϑ a =-10° C

-0.01 -0.01 -0.01 -0.03

2)

0.867 0.860 0.853 0.844

ϑmin (°C)

Double-leaf exterior wall 3)

16.0 15.8 15.6 15.3

ϑ i =+20 °C

Insulation Isomur plus Ψ a 1) (W/mK) (cm) Type 16 14 12 10

ϑ a =-10° C

f RS i ϑ mi n

0.14 0.17 0.19 0.21

0.863 0.846 0.836 0.825

15.9 15.4 15.1 14.8

ϑ i =+20 °C

ϑ i =+10 °C

Isotherms for thermal insulation composite systems

20-15 20-17.5 20-20 20-24

-0.02 -0.03 -0.03 -0.04

ϑmin 3) (°C)

f RSi ϑ mi n

ϑ i =+10 °C

Interior wall Isomur plus Ψ a 1) (W/mK) Type

20-15 20-17.5 20-20 20-24

fRsi 2) —

fRsi 2) —

ϑmin 3) (°C)

0.857 0.843 0.834 0.827

18.6 18.4 18.3 18.3

Isotherms for double-leaf exterior wall

ϑ a =-10° C

ϑ i =+20 °C f RSi ϑ min

1) externally-referenced thermal bridge loss coefficient Ψ a for Rse = 0.04 and Rsi = 0.13 (m2K/W) 2) temperature factor fRSi=(ϑmin-ϑa)/(ϑi-ϑa) for Rse = 0.04 and Rsi = 0.25 (m2K/W) 3) minimum surface temperature ϑmin 4) rated value of the thermal conductivity according to approval, equivalent λ value on the homogeneous body

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ϑ i =+10 °C

Isotherms for interior wall above an unheated basement

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Static measurements Masonry strength class 20 Isomur plus elements

Isomur plus

Perspective

High - s trength, l i g h t w eigh t con c re t e Polystyrene rigid foam

Type

Element width B (mm)

Element height H (mm)

Element length L (mm)

20-11.5 20-15 20-17.5 20-20 20-24 20-30*

115 150 175 200 240 300

113

600

Load-bearing Thermal concapacity ductivity 1) kN/m (W/mK)

corresponding to approval

0.245

* Type 20-30 with no approval

1) Rated value of the thermal conductivity, equivalent λ value on the homogeneous body The dimensioning of the masonry walls using Isomur plus is made in accordance with DIN 1053, part 1.

The approval Z-17.1-811 lists all the provisions which deviate from the standard. They relate to: Earth pressure Isomur plus is used exclusively in walls with no permanent earth pressure load.

Spatial stiffness For masonry walls with Isomur plus a calculated proof for multiple-level buildings with up to two full storeys and a complete attic floor can be dispensed with according to the prerequisites specified in DIN 1053, part 1, paragraph 6.4.

Zone 3 and 4 seismic areas The proof of sufficient building stiffening comes from interior walls, as in the specified zones walls with Isomur plus are not taken into account in the calculation.

Base values σo of the permissible compressive stress in accordance with the approval 2): Isomur plus Type

Strength class of the sand-lime brick

20-11.5 20-15 20-17.5 20-20 20-24

12 ≥ 20

Base values σo of the permissible compressive stress in N[mm2] Masonry with mortar in accordance with DIN 1053-1

Normal mortar of mortar group IIa

Normal mortar of mortar group III

Thin-bed mortar

1.6 1.9

1.6 1.9

1.8 2.4

2) Masonry: sand-lime brick or concrete precision block in accordance with DIN 106, part 1; Solid brick in accordance with DIN 105, part 1 or 2 (perforation volume ≤ 15%)

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ISOMUR® - on a secure footing

ISOMUR 速 Wall base construction Thermal insulation composite system Thermal insulation element on the floor

Thermal insulation element under the floor

Iso m u r p l us

Iso m ur p l us

Double-leaf masonry Thermal insulation element on the floor

Thermal insulation element under the floor

Iso m ur p l us

Iso m ur p l us

12

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Installation instructions Installation above the basement floor Lay the Isomur plus full-surface as the first row of bricks in the layer of mortar with no butt joint mortar mix. The element position is shown by the labelling.

The elements must be carefully aligned, in particular with regard to a level and horizontal bearing surface for concrete precision block masonry.

The Isomur plus elements should be bricked over as soon as stability is guaranteed by the hardened mortar.

When thin-bed mortar is used for the concrete precision block masonry it must be spread such that a joint thickness of at least 1 mm and a maximum of 3 mm results on the polystyrene rigid foam and any minus tolerances of the lightweight concrete support structure are compensated.

Installation below the basement floor Lay the Isomur plus full-surface as the last row of bricks in the layer of mortar with no butt joint mortar mix. The element position is shown by the labelling.

General notes Protect the polystyrene rigid foam from contact with solvents and excessive heat.

Isomur plus can be trimmed using conventional building tools. The shortened length segments must be at least 20 cm long. Shortened length segments must not be placed adjacent to each other.

Isomur plus elements must not be laid above each other as walling.

Slots and recesses that weaken the support cross sections are not permitted.

min

. 2 0

cm

Eleme nts but t jo i n t e d w i t h no b u t t joint mortar m i x

13

ISOMUR速 - on a secure footing

ISOMUR ® References

14

[1]

Federal Government: Ordinance on energy saving thermal insulation and energy saving systems engineering for buildings (Energy Saving Ordinance – EnEV), Federal Law Gazette No. 59 of 21 November 2001, Bonn.

[2]

DIN 4108, Supplementary sheet 2: Thermal insulation in building construction, Supplementary sheet 2, Thermal bridges – design and construction examples. Beuth Publishing.

[3]

DIN EN ISO 10211 Thermal bridges in building construction – Heat flows and surface temperatures. Beuth Publishing.

[4]

DIN 1053-1 Masonry, Part 1: Design and construction. Beuth Publishing, Berlin.

[5]

Gierga M., Kieker J.: “Exterior wall construction following the introduction of the Energy Saving Ordinance”, Masonry, 4/2002

[6]

Maas A., Höttges K., Kammer A. – University of Kassel, Dept. of Building Physics, 7/2002

[7]

Martinelli R., Menti K.: “Wall base elements: Dry (wall-) bases for comfortable spaces”, TZ Bau + Architektur, Issue 3, 2001

[8]

Fire Protection Technical Test Certificate No. 3239/224 1a, IBMB – Institute for building materials, solid structures and fire protection, Technical University of Braunschweig

[9]

Expert’s report No. 99078-Hn on fire protection of the wall base insulation elements “Isomur light”, Hahn Consult, Braunschweig, 2000

[10]

Inspection report No. 13.17388 on the water absorption of Isomur elements, FMPA Baden Württemberg, Stuttgart

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Request for tender ___________________________________________________________________________ Work section: 012 Masonry

Area of application: DIN 276 Exterior and interior walls

__________________________________________________________________________________

ISOMUR® Wall base elements 01

Wall base elements type Isomur plus load bearing, water impermeable, thermally insulating. As the first or last layer in the rising masonry. The element is comprised of a bearing structure made from high-strength, lightweight concrete and polystyrene rigid foam.

General Technical Approval (DIBt, Berlin) [German Institute for Construction Technology] No. Z-17.1-811 Rated value of the thermal conductivity: λ = 0.245 W/(mK)

02

Required for construction are:

03

.......

m Isomur plus type 20-11.5

(h/b/l) 113/115/600mm

04

.......

m Isomur plus type 20-15

(h/b/l) 113/150/600mm

05

.......

m Isomur plus type 20-17.5

(h/b/l) 113/175/600mm

06

.......

m Isomur plus type 20-20

(h/b/l) 113/200/600mm

07

.......

m Isomur plus type 20-24

(h/b/l) 113/240/600mm

08

.......

m Isomur plus type 20-30

(h/b/l) 113/300/600mm

09 10

delivery and installation installation is made in accordance with specifications from H-BAU Technik GmbH Am Güterbahnhof 20 79771 Klettgau-Erzingen Tel.: 0 77 42 / 92 15-20 Fax: 0 77 42 / 92 15-90 www.h-bau.de

11 12 13

Material Labour Unit price

.................... .................... ....................

14

Total price

....................

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ISOMUR® - on a secure footing

Concreting with system...

80mm Balcony insulation elements 120mm Balcony insulation elements Transport anchors Shuttering tubes Shear dowels Reinforcement connectors Reinforcement connectors Masonry fixings Sealing technology Sealing technology Rustproof stainless steel Shuttering elements Shuttering elements Shuttering elements Sound insulation elements Spacers H-BAU Technik GmbH Am Güterbahnhof 20 79771 Klettgau-Erzingen Germany Tel. + 49 (0) 7742 92 15-20 Fax + 49 (0) 7742 92 15-90 info.klettgau@h-bau.de Production North East Brandenburger Allee 30 14641 Nauen-Wachow Germany Tel. + 49 (0) 3 3239 775-20 Fax + 49 (0) 3 3239 775-90 info.berlin@h-bau.de

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03/2011

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