12 minute read
Lime Green 23 Besa Academy
Matching tradition and heritage
“The cottage was a listed building, so we collaborated with the conservation officer and followed Historic England guidance to ensure we preserved the historical elegance of the property and best practice,” says Alex.
Advertisement
“Breathability was also incredibly important. Much of the water damage from the fire had dried out, but the original structure of the building only contained an ‘outer leaf’ wall.
“An ‘outer leaf wall’ means that as soon as the outside wall gets wet, the inside wall becomes vulnerable to damp.
“Protecting the building, called for a way to keep it dry, healthy and comfortable for a long time to come. We specified a woodfibre board with a lime plaster internally and lime render externally. The cottage was originally built using lime-based products and had stood the property in good stead all these years until fire tore it apart.
“Lime Green was recommended to us by a friend who’d used their mortars, plasters and renders on several occasions and found them to be ideal.
“They gave us a ‘one-stop-shop’ for all the lime-based materials we needed: Internal Warmshell Insulation (IWI) system (woodfibre insulation boards topped with Solo lime plaster) and an external lime render. “We had some great technical advice from the Lime Green team. They helped us understand our lime-based options, how different products and materials work together, and how to get the best results. Their products make lime very easy to use.
“It is so good to return the cottage back to its former glory, with modern versions of the honest materials that would have been used in the Medieval and Victorian eras.”
Restoring traditional beauty
“I’d used traditional lime products before, but the process was always much slower – waiting for up to seven days between coats while the material fully dries out,” says Ian Miller, master plasterer.
“Lime Green’s materials were much quicker to use – just put a coat on, notch with a trowel, embed mesh all over, apply another 3mm on top, flatten, leave for 1.5 hours and finish with a trowel. That’s it – you do the wall once, instead of up to three times, as with other lime plasters I’ve used.
“The products – Solo (one coat lime plaster) and Ultra (insulating base coat) – are great and easy to work with. Once you’ve got the consistency right, they’re easy to apply and the finish is absolutely fantastic.
“The homeowner is so delighted with the finish, they and the architect have agreed just to seal the walls and to leave them unpainted – something you only usually do if you’re polishing or marbling plaster. “It’s a learning experience at the start, as you begin to understand how to use the lime plaster, but it’s incredibly easy to pick up. If it does start to dry, you can damp it down and it comes back to life again. It’s very workable.”
An elegant finish
“The homeowner is thrilled,” says Alex. “The project has delivered the best of both worlds: a restored home, using traditional materials, which means it will stay dry and warm.” “The home looks absolutely beautiful. Everyone involved couldn’t be happier with the results,” finishes Alex. “Lime Green’s experience and knowledge in regard to the project specifications, and the team’s practical assistance on site, means we’ll definitely be recommending them for future projects. “It’s been a privilege working with a team of talented and experienced contractors, hand in hand with Lime Green, to give this historic cottage the opportunity to continue to be a beautiful dwelling for anyone who becomes part of its future story for hundreds of years to come.”
To find out more about the materials used, visit Lime Green Products Ltd or call 01952 728 611.
January 2022
Lindapter fire rated range of Decking Fixings
At the request of the UK Sales Engineers Lindapter commissioned BRE Global Ltd to assess the performance of a number of decking fixing products when subjected to a standard fire exposure whilst under a specified load. The performance was assessed in terms of their ability to maintain the load under prescribed heating conditions.
The decking fixings were installed into concrete backed composite decking profiles using M8 threaded rod (property class 8.8) and tightened to our recommended torque as per our installation instructions. A specified load as outlined in the table below was hung from the fixing and exposed to the standard fire curve according to BS EN 1991-1-2. Tests were repeated and the failure time was recorded as the time when the fixing can no longer sustain the suspended load. In all but one test the failure mode was recorded as thermal expansion of the composite deck which led to the deformation of the re-entrant and ultimately loosening of the fixing.
Below are the load limits and exposure times based on the tests performed for a 60 minute and 90 minute fire rating, please note that these are absolute values.
Temperature (°C) 945°C 1006°C Test Duration (mins) 60 minutes (F60) 90 minutes (F90)
Product Type Tensile load (kN) Tensile load (kN)
COM10 0.60 0.375
AW08/AW10* 0.40 0.250
TR6008/TR6010 0.40 0.250 MF08/MF10 0.78 0.441
MW08/MW10* 0.78 0.441 For standard safe working loads with factors of safety at ambient temperature please refer to the Lindapter website. In addition to the above, Lindapter’s range of decking fixings are also considered to satisfy the requirements of performance class A1 (non-combustible) for the characteristic Reaction to Fire, in accordance with the EC decision 96/603/EC.
The BRE Global test report P116310 Issue 1 is available on request. More information on Lindapter products and their fire ratings can be found on the company’s website: www.lindapter.com
*Calculated values based on tests performed on similar designed products
What is a Heat Pump?
It is a direct expansion cycle (DX) that comprises of a Compressor, an Evaporator a Condenser and an Expansion Device. It uses refrigerant as a media to transfer unwanted energy (heat) from inside to outside (cooling) or from outside to inside (heating). In the system there is a reversing valve that changes the evaporator to a condenser and a condenser to an evaporator (hence the reverse cycle term).
Why refrigerant? Refrigerant is a chemical gas that changes phase from gas to liquid and visa versa. It is extremely energy efficient and can carry more the 50 times energy per weight than air and 10 times more than water. It boils at as low as -50°C (water +100°C) and condenses at as high as 140°C. These characteristic makes it suitable for most habitable areas of the world, smaller inter connecting pipes and compact and very cost effective.
The refrigerant safety class for domestic use MUST be A1 class non-flammable. There are other classes A2, A2L flammables and can be explosive under pressure and A3 highly flammable and explosive. Classes are as defined by ISO817 & ASHRAE 34 standards
The efficiency of cooling (EER) cycle or heating cycle (COP) can range anything between 250% (2.5/1) to 500% (5/1) (that is for every energy unit, say1 kW electricity consumed, up to 5 kW can be absorbed from inside (unwanted heat) to be rejected outside or absorbed from outside air or water or ground and transferred to inside to heat a house or domestic hot water).
There are mainly Air to Air (most common and cost effective), Water to Air & Water to Water systems. Systems can be compact (all components in one box) or Single Splits One indoor and One outdoor or Multi Splits where multiple indoor units connected to One outdoor unit.
The Indoor units can be a wall, floor, Ceiling or Ducted fan coils or a refrigerant to water heat exchanger to provide domestic hot water or medium temperature heating water for under floor heating or radiators. The interconnecting refrigeration pipe work would require specialist approved refrigeration engineers.
There are no extra safety control systems (provided the refrigerant is A1 class non-flammable) and no chimneys, extra builder’s work or electrical supplies.
Safe, Healthy, Energy Efficient & Environmentally Friendly Heat Pumps*
Ideal for domestic application
LG One to One & Multi Splits
Ideal for Domestic/Apartments
Heating / Cooling
Up to 5 rooms from one outdoor unit
LG VRF V™ S
Ideal for Residential & Small Commercial/Offices
Heating / Hot Water / Cooling
Up to 11 indoor units from one outdoor unit
COMPACT & MINI
Wall Gallery Wall Mirror Concealed Ducted Console
HOT
HK - Hydro Kit
LG Therma V™
Ideal for Domestic/Apartments Heating & Hot Water Medium or High Temperature Mono & Split Systems
VARIOUS APPLICATIONVarious applications
RADIATOR FLOOR HEATINGRadiators Floor-heating HOT WATER Hot water
* All Heat Pumps supplied by Space Air contains Non-flammable A1 Class Refrigerants such as R410A
Space Air are under obligation to meet H&S 2016 No. 1107 Statutory Instrument to not supply equipment containing A2L class (R32) flammable refrigerant without conforming to Part 2 of the Statutory Instrument.
MAGPLY A1 BOARDS SHEATH HYBRID ELEMENTS TO MODULAR HOTEL BUILD IN KENT
The development of a 140 bed Hampton by Hilton Hotel in Ashford, Kent, is featuring the use of Magply A1 Euroclass non-combustible boards for sheathing vertical and horizontal sections around the six-storey modular volumetric structure, offering excellent strength and durability as well as Class O fire resistance and good acoustic properties.
The project is being undertaken by Ashford based main contractor, Rees Mellish, while Bowman Riley was the architectural consultancy which gained the final planning consent and supervised work on site.
The high performance Magply boards from IPP were supplied by the local branch of Jewson builders’ merchants. In order to optimise the build programme as well as the use of factory manufactured bedroom and other modular units, the final design made use of in-situ reinforced concrete elements as well as steel and timber framing for the parapet wall at roof level, both of which have been sheathed using Magply boards.
Bowman Riley’s Associate responsible for the project: Roy
Wilson, commented: “When we were brought in we revisited the planning application and gained consent for an extra storey, before completing the detailed design: including the cladding solution. The client has carried out a number of value engineering exercises, leading to the use of traditional reinforced concrete infill between some of the modules, in order to reduce the number of different types across the project and then again at high level around the parapet there is steel framing.”
The Project Manager for Rees Mellish, Mark Herridge ,
explained: “For the areas where the reinforced concrete frame separates the modules we needed a fire resistant board and therefore asked Jewson’s sales manager to recommend one. Fortunately, they had the Magply 12mm boards in stock which met all of the requirements and which our installers have found easy to cut and fix. As well as the vertical bands at several locations around the elevations, the boards are also used to cover the parapet wall which steps out just below the roof. It is secured to the steel and timberwork infill, while the ‘helping hand’ brackets for the cladding are then secured back through the boards. It’s a good product overall.” Magply MgO boards, available in 9mm,12mm & 20mm thickness, it presents a fire-safe and environmentally friendly alternative to conventional plywood or OSB products. Additionally, the unique production process minimises chloride content, enhancing both stability and long-term durability. The different thicknesses of panel are also widely used as a substrate board for the direct application of proprietary render systems, as well as for flooring and flat or pitched roof build-ups.
FOR FURTHER INFORMATION, PLEASE CONTACT: GORDON PIRRET, MD or JOHN MALONE, UK NATIONAL SALES MANAGER
IPP LTD. BRADWELL HALL BRADWELL ON SEA ESSEX CM0 7HX.
T.01621 776252 F.01621776688 EMAIL: gmp@intpetro.com or
john@magply.co.uk www.magply.co.uk
MODULAR HOUSING INSTALLED OVER MARMOX THERMOBLOCK BREAKS AT SELBY
A Yorkshire based groundworks and civil engineering specialist is making innovative use of Marmox Thermoblocks in constructing the oversites across a development of over 100 affordable homes which are being craned into position as factory fabricated modules.
Alfa Site Services is experienced in working with all of the UK’s major housebuilders, as well as infrastructure specialists like Kier and has purchased 720 of the 600 x 100 x 65mm Thermoblocks from Encon Insulation of Leeds, with the merchant also supplying some 50 cartons of Marmox’s versatile highperformance 360 adhesive, used to bed the blocks and bond their overlapping joints. This well proven installation method helps achieve the accurate alignment and stability necessary for the modules to be craned into position.
Alfa’s Senior Manager Site Services, Rick Harrison,
commented: “The site was originally a railway siding, with the made-up ground requiring 2.5 metres deep foundations and then levels are being built up by a metre to deal with flood risk: leading us to lay three courses of blocks. Installing the Thermoblocks using the 360 adhesive is quite time consuming, but it is basically a very good product and there have been no actual issues. Once the course of Thermoblocks is complete we hand over to the developer’s site management team to actually install the modules. This is a significant project involving a number of technical aspects which were new to us, but I think this could represent the way ahead for construction and we have been proud to be involved as the principal contractor.”
Marmox Thermoblocks are available in widths of 100, 140 or 215mm and are formed from sections of XPS (extruded polystyrene) encapsulating two rows of high strength, epoxy concrete mini-columns.
These are attached at either end to the top and bottom layers of glassfibre reinforced polymer concrete, to ensure a good bond with the rest of the structure.
As well as combatting cold bridging where the inner leaf of masonry walls abuts the floor zone, Thermoblocks are also often utilised to support timber frame construction or at vulnerable upper floor junctions, including beneath parapet walls.
FOR FURTHER INFORMATION, PLEASE CONTACT:
MARMOX (UK) LTD. CAXTON HOUSE 101-103 HOPEWELL DRIVE CHATHAM KENT ME5 7NP.
TEL: 01634 835290 FAX: 01634 835299
EMAIL: sales@marmox.co.uk WEB: www.marmox.co.uk
