External Wall Insulat ion Training Guide For perfect application every time
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Int roduct ion...
Content s...
This Guide supplements the training provided by Weber and is a quick reference to the key stages in the installation of weber.therm External Wall Insulation systems.
Introduction and contents
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Health and safety
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For full technical details on all weber.therm systems, please refer to Site Application Guides, and our website www.netweber.co.uk.
Preparation... base bead fixing
Weber can provide technical and application support for all house types including a wide range of non-traditional and system built construction types.
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Preparation... Preparation... beads, sills and trims Preparation... fixings
4-6 7 8-9 10-13
Preparation... boarding around windows
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Preparation... preparation for rendering
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Preparation... weather working
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weber.therm XM... basecoat
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weber.therm XM... rendering
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weber.therm XM... topcoat finishes
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weber.therm XM... RB brick effect
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weber.therm XP...
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weber.therm XP... scraped finish
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weber.therm XP... light ashlar details
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weber.therm XP... spray rough cast
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weber.therm XP... dry dash finish
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weber.therm XP...
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Copyright Saint-Gobain Weber – not to be reproduced without permission.
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Healt h and Safety...
Health and safety is the number one priority at Weber. This applies to our behaviours on construction sites, in our factories and offices, and on the road. We also want to ensure that our customers are safe – so please follow the use of Personal Protective Equipment shown in this Training Guide at all times.
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Preparat ion... Before you start make sure you know what standard is required... ...you know the size of the job and that the access is suitable.
Check that the materials on site are correct for specification and are stored correctly.
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As soon as access is available drench all areas with weber CL150.
Hammer test suspect wall surface for spalling and flaking. Hack-off to sound substrate. Brush down with stiff bristle brush.
Defective areas under 0.1m2 can usually be ignored.
Make good areas to existing surface. Level using Weber Render repair specification.
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Where possible remove unnecessary or damaged features to simplify detailing.
Insert ventilators over existing unless otherwise instructed.
At this stage builder work needs to be completed. Extend overflows verges etc. Install new windows where applicable. Remove satellite dishes.
Cut out insulant to profile of specified ventilators and bed into opening using weber.rend LAC.
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Preparat ion... beads, sills and t rims Fix verge trim if existing overhang is insufficient and verge is not to be extended.
Fix new oversills or undersills as designed.
100mm minimum
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Preparat ion... base bead fixing Fix specified base bead at 700mm centres to line and level using short drill and drive pins.
Full system base beads are normally fixed with heel on DPC Line.
A string line will give better alignment.
DPC
Don’t over-drive the fixings. For below DPC, Weber has speciďŹ c detailing recommendations. Please refer to Site Packages for details.
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Temporary fixing to support flashing.
Box bead joining clip.
2mm Gap with box beads fully inserted Into joining clip.
Where new lead flashings are required, surface fix these behind base bead profile. No need to raggle into wall.
Fix specified base bead to wall to line and level using short drill and drive pins.
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Preparat ion... fixings If the type of fixing is in doubt or the strength of substrate, carry out a pull-out test, minimum pull-out forge per fixing - 0.75 KN.
IDIOT!
OI!
Use a flippin meter.
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All insulation boards should be fixed with five fixings per board. Cut boards should be fully supported with fixings at sides and corners as appropriate. Fixing types are contract-specific with thermal fixings being the most commonly required. Non-standard substrates may require special fixings – if in doubt consult Weber for advice.
Ask our advice on the best machine for the job – some are considerably better than others. Don’t over-drill.
Worn drill bits make pinning difficult. Rate of wear depends on substrate and depth. Replace bits to maintain hole size. Before contract starts, try different drill bit sizes with selected pin. Most practical drill bit size depends on substrate. 1-2mm makes a big difference But… Pull out requirement still applies.
Not recommended
Don’t overdrive fixings. Don’t distort pin heads. Don’t drive pins squint.
Always use the depth gauge on the drill. Remember to ream holes clear of dust before pinning.
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Starting from the corner, apply boards broken bond to wall. Form lap bond at arris. Drill and pin according to board type and Weber package.
Butt boards closely both horizontally and vertically.
Fill gaps over 6mm between boards using a proprietory foam filler.
Maximum acceptable gap 6mm.
e Note: Gap fillers ar res su ea m t or res t las ly! on emergency
For full boards, ďŹ xings should be 150mm from all board edges.
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Movement or risband joints (existing). Cut insulation on line of joint after boarding.
Supplement fixings as required after cutting.
Insert Insulation into reveal if specified. This may be mechanically fixed or stuck and bedded with adhesive mortar. Refer to contract details for specified reveal boarding.
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Preparat ion... boarding around windows Check board around corner Don’t have board edges aligned with opening either horizontally or vertically.
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Preparat ion... preparing for rendering Before rendering starts, check boarding pattern and alignment, beads, fixing and trim.
Protect vulnerable surfaces especially sills and glass. Protect at ground level with hessian or polythene.
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Preparat ion... weat her working All Weber mortars are available factory-batched and dry-bagged. They are pre-mixed in a dry state and only need water, no other additions required.
Avoid rendering in hot weather or on sunny walls. Too rapid dehydration will result in a weak powdery coat. Wet down undercoat thoroughly. Slowdown curing period by shading.
tial ssen s e l l t A dien . ingre the bag n i e r a
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Don’t render in freezing weather. Temp must be 4°C and rising. Protect new render from frost. Don’t apply to frosted surfaces. Don’t use frozen material.
Don’t render in wet weather or if background is saturated, otherwise wash-off will ruin the coat. Lime bloom or staining will spoil the appearance. Bond will be weakened.
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weber.therm XM... basecoat
Apply first pass of Lay meshcloth into first pass of render weber.rend LAC whilst still wet. onto insulation. First pass should be 3mm thick. Lap meshcloth 100mm in each direction.
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Apply second pass of render when first pass has taken up. Unsure mesh pattern is completely obscured. Second pass should be 3mm thick.
Allow first coat of render to dry for 36 hours before next stage.
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Meshcloth
Apply supplementary reinforcements at all corners of openings using a 250mm square of Meshcloth applied diagonally.
Use meshcloth in the longest length practical.
Meshcloth is cut using scissors or a stanley knife.
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weber.therm XM... rendering If a primer and acrylic coat has been specified, sponge float the weber.rend LAC base coat.
Apply adhesive mortar over meshcloth thick enough to obliterate meshcloth pattern.
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If a further render coat has been specified (dash receiver, scraped top coat or brick effect finish) weber.rend LAC base coat should be comb scratched.
Because the insulation effectively prevents drying stresses being taken by the substrate (as in normal brick or block background) the scratch coat must be allowed to dry and shrink fully before subsequent coats are applied. Recommended minimum 36 hours. The low shrinkage characteristics of Weber renders minimise risk of cracking. Note: 3-7 days curing for synthetic finishes.
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weber.therm XM... topcoat finishes Synthetic finish Ensure weber PR310 primer is fully dried. If applying a decorative finish, apply only to the depth of the aggregate in the product, e.g. 1.5mm.
Dash top coat Once levelled, dash aggregate can be applied. Ensure all areas are evenly covered.
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weber.therm XM... RB brick effect Brick effect render. Apply weber.rend RBB (render brick base coat) 7mm thick over fully cured weber.rend LAC. When taken up, apply 3mm of weber.rend RBF (render brick face coat). Texture of brick face can be achieved with a soft bristle brush whilst wet. When taken up, begin to cut back to mortar coat in pattern specified. Use spirit levels and straight edges for best effect.
Clean tools often with water.
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weber.therm XP...
Pump first pass of initial render coat onto insulation blocks. First pass should be 6-7mm thick.
Lay meshcloth into first pass of render whilst still wet.
Pump second pass of render when first pass has taken up. Ensure mesh pattern is completely obscured. Second pass should be 8-9mm thick.
Level second pass with short trowel or straight edge.
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weber.therm XP... scraped finish Between 5-16 hours after application, (depending on weather) scrape back to 12mm (remove 2-3mm) with scraper tool. Use an ‘I’ section scrapper to identify and remove any high points in render.
Always keep scraper tool flat to render surface.
Use a regular, circular scraping motion with even pressure to ensure a consistent finish.
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weber.therm XP... light ashlar details Scrape render back to 15mm. Cut ashlar 2-3mm deep.
Scrape back to leave a minimum of 15mm
Use a straight edge to guide ashlar tool on long straight cuts.
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weber.therm XP... spray rough cas t Pump render to 6mm, lay in mesh, pump second application of render to 6mm, render pump rough cast. Pump first pass 6mm thick.
Lay in meshcloth then pump second pass 6mm thick.
Adjust pump pressure and nozzle size to achieve desired rough cast effect.
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weber.therm XP... dry dash finish Pump render to 6mm, lay in mesh, pump second application of render to 6mm, roughly level then dash at once. Pump first pass 6mm thick.
Lay in meshcloth then pump second pass 6mm thick.
Rough level then dry dash at once.
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weber.therm XP... For below DPC level. Weber produce an RBF render for use with weber.therm M1.
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Following this guide can help you achieve the perfect finish. More information is available from our website. www.netweber.co.uk
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Our ot her act ivit ies...
Technical Mortar Products
Tile Fixing Products
Renders & Decorative Finishes
Flooring Systems
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UK Weber app Use the QR code opposite to download the UK Weber app
@SGWeberUK
IE Weber app Use the QR code opposite to download the IE Weber app
@SGWeberIE
Rev 05/16
Saint-Gobain Weber Dickens House, Enterprise Way, Maulden Road, Flitwick, Bedford, MK45 5BY Telephone: +44 (0) 8703 330070 Fax: 0800 014 2995 Email: mail@netweber.co.uk Website: www.netweber.co.uk The Old Paper Mill, Ballyclare, Co Antrim, BT39 9EB Telephone: +44 (0) 2893 352999 Fax: +44 (0) 2893 323232 Email: mail@weber.ie Website: www.weber.ie