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webertherm XM thickcoat silicone system (EPS)

Verified by manufacturer 4 months ago

Saint-Gobain Weber

Render protected, mechanically fixed external wall insulation (EWI) system based on expanded polystyrene (EPS) insulant, a weberend PTC second coat and a webersil TF top coat.

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Application

  • Suitable for use in buildings with a floor not exceeding 18 m above ground level for England and Wales, with a reduced height of 11 m for Scotland.
  • Weber only recommends this system is used on single occupancy domestic dwellings no more than 3 storeys in height.

Description

[Formerly known as webertherm XM PMR324]


Render protected, mechanically fixed external wall insulation (EWI) system based on expanded polystyrene (EPS) insulant with meshcloth reinforced basecoat, a top coat and a textured synthetic finish.


Features and benefits:

  • Chlorofluorocarbon (CFC)/ hydrochlorofluorocarbon (HCFC) free.
  • Good impact resistance.
  • Provides weather protection.
  • Lightweight.
  • A wide range of finish coat colours are available.
  • Can be used for decorating and re-modelling existing facades.
  • BBA approved.
  • When installed to a masonry substrate and maintained in accordance with the manufacturer's recommendations, the system will remain effective for at least 30 years. The durability can be extended to 60 years by using specific fixings, accessories, additional adhesive and by following a planned inspection and maintenance schedule. Consult manufacturer for details.


System components:

  • Weber fixings as specified for the substrate.
  • webertherm EPS insulation (of specified thickness).
  • weberend LAC (first layer, 3 mm).
  • weber standard meshcloth.
  • weberend LAC (second layer, 3 mm).
  • weberend PTC (6 mm thick).
  • weber PR310 primer.
  • webersil TF.

The installation must be capable of resisting all dead loads and design live loads, including impact and wind loads, and accommodate all thermal movements without damage.

System installation is to be strictly in accordance with Saint-Gobain Weber specification. Please note that any other manufacturer's products used within the system will invalidate the guarantee, and the performance cannot be supported.

Remedial work must be completed prior to the installation of Weber EWI Systems.


Recommendations:

  • The system should meet the building regulations requirements in compliance with BR 135. This includes achieving fire compartmentation of the structure using non-combustible fire barriers (webertherm MFL), installed vertically or horizontally at vulnerable areas such as window openings, doorways, penetrations and each floor level above the first floor level. The BR 135 recommends for each barrier to consist of a non-combustible material 100 mm minimum in height, which is fully bonded with weberend LAC and mechanically fixed using appropriate fire fixings through the meshcloth coat at maximum 400 mm centres. Additionally, install appropriate fire fixings (stainless steel as per BRE 135) at a rate of 1/m² minimum across the whole area receiving the above system.
  • Fixings must penetrate the structure in accordance with the fixing design to provide the appropriate pull out resistance. A survey of the building must be completed by an engineer to ensure the additional load does not have a detrimental effect on the building and the fixings are able to sufficiently penetrate the structure, to adequately support the Weber system. Weber will undertake fixing pull out tests and verify the adequacy of the fixing design based on a wind loading assessment carried out in accordance with BS EN 1991-1-4: 2005.

General information

Color

-

Manufacturer guidance

160 standard colours available

Finish

Silicone

Guidance for specification option:

webersil TF

Textured

Material

Expanded polystyrene (EPS)

Uniclass

Ss_25_45_72_28 External wall insulation systemsPrimary

CAWS

M21/20 External wall insulation system . . . . . .

M21/210 External wall insulation system

Product range

External wall insulation systems / For masonry
External wall insulation systems / Reaction to fire: B-s1,d0

Specification data - External wall insulation systems

Preparation

Not required.

Weber CL150 Fungicidal Masonry Wash.

Guidance for specification option:

For existing substrates, or where required on new substrates, drench apply CL150 wash and leave for 48 hours, then brush down to remove all moss/ growth.

Insulation

-

Material

EPS.

Manufacturer guidance

  • Plain expanded polystyrene, SD/FRA grade.
  • Size: 1200 x 600 mm.
  • Nominal density: 14–16 kg/m³.
  • Thermal conductivity: 0.032 W/m·K.
  • Fire classification: Euro Class E; when part of webertherm XM: Building Regulations National Class 0 when tested to BS 476 Part 6 and 7.
  • Maximum water vapour permeability: 0.018–0.036 mg (P.a.h.m).
  • Fixings: Five required per insulation board.


Adhesive

weberend LAC rapid.

Guidance for specification option:

Required to comply with SWIGA guarantee requirements on all buildings greater than four floors in height above ground level. Consult manufacturer and insert requirements.

Additional mechanical fixings

-

Manufacturer guidance

Fixings are dependent on wind load and pull out strength, please contact Weber for advice.

Fire barriers and stops

-

Material

MFL.

Fixings

Stainless Steel (At 400 mm centres).

Movement joints

-

Form with

-

Manufacturer guidance

Please contact Weber for bespoke details

Render carrier or reinforcement

-

Material

Balanced, open weave, alkaline resistant glass fibre meshcloth.

Mesh size

3.5 x 3.5 mm.

Render

-

Application

Can be hand applied or sprayed.

Material

weberend LAC rapid and weberend PTC.

Manufacturer guidance

- First coat:

To be applied in two coats, incorporating meshcloth insulation board. Apply 2–3 mm thick, incorporating weber meshcloth. Allow for partial take-up then apply further 3 mm to form a nominal 6 mm thick monolithic coat.

- Second coat:

For dry dashing or smooth floating to take synthetic finishes, coloured and polymer modified.

- Final coat:

  • Can be applied with a thin plastic float.
  • Primer: Can be brush, spray, or roller applied.


Decorative finish

webersil TF.

Colour

-

Manufacturer guidance

160 colours available

System accessories

-

Manufacturer guidance

Full system and render only beads, if required by the system or product, or if specified, shall be of appropriate design, gauge and material (aluminium/ polyvinyl chloride (PVC)/ stainless steel) - consult manufacturer for details. Some available accessories are listed below:



  • Clip on nose beads.
  • Compressible sealing tape.
  • Fire barriers: Consult manufacturer for details.
  • Full system Weber base bead: Aluminium box profile with clip on nosing.
  • Overcills.
  • Render-only drip/ corner beads.
  • Undercills.
  • Verge flashing.
  • Weber frame seal – Can be used as an alternative at windows to provide a mastic free seal with improved aesthetics/ maintenance.
  • Weber pre-coated, pressed aluminium under cill trims: 1.2 mm thick (nominal), size to suit EWI System, if required.
  • Weber pre-coated, pressed aluminium verge trims: 1.2 mm thick (nominal), size to suit EWI System, if required.
  • Weber PVC corner, stop, drip and movement beads: As required.
  • Z flashing.


Cavity barriers

Type, thickness, density and compressive strength to be determined by the design team.

Guidance for specification option:

Consult manufacturer for details.

Sealant joints

Low modulus silicone.

Guidance for specification option:

Consult manufacturer for details.

Density

15 kg/m³.

Thickness range

62-212 mm.

Weight

160 g/m².

Roll size

1 x 50 m.

Fire performance:

B-s1,d0 when classified in accordance with BS EN 13501-1.

Fixings

To be confirmed on-site by pull out tests in accordance with BS EN 1991-1-4.

Primer

weber PR310.

Guidance for specification option:

Low viscosity liquid.

Sustainability data

Country of material origin

United Kingdom

Country of product manufacture

United Kingdom

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Platform Compatible Version
Revit
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2

IFC
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2

Literature

External Wall Insulation for refurbishment

External Wall Insulation for refurbishment

Weber synthetic colour guide

Weber synthetic colour guide

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