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Multitherm 1.74m x 580 board
Multitherm "tongue and groove" connection
Multitherm on a CLT construction with open jointed cladding

Gutex Multitherm

Environmental Product Declaration (EPD) Certification Natureplus FSC PEFC
Environmental Product Declaration (EPD) Certification Natureplus FSC PEFC
Environmental Product Declaration (EPD) Certification Natureplus FSC PEFC
Environmental Product Declaration (EPD) Certification Natureplus FSC PEFC
Environmental Product Declaration (EPD) Certification Natureplus FSC PEFC
Environmental Product Declaration (EPD) Certification Natureplus FSC PEFC
Environmental Product Declaration (EPD) Certification Natureplus FSC PEFC
Environmental Product Declaration (EPD) Certification Natureplus FSC PEFC
Environmental Product Declaration (EPD) Certification Natureplus FSC PEFC
Stock code: GM40N
Stock code: GM60N
Stock code: GM80N
Stock code: GM100N
Stock code: GM120N
Stock code: GM140N
Stock code: GM160N
Stock code: GM180N
Stock code: GM200N

Gutex Multitherm

Natural wood fibre T&G external insulation board

Size and thickness:
£9.20

Excl VAT

£13.80

Excl VAT

£18.30

Excl VAT

£22.90

Excl VAT

£27.40

Excl VAT

£31.90

Excl VAT

£36.50

Excl VAT

£41.10

Excl VAT

£45.70

Excl VAT

£9.20

Excl VAT

In Stock: Usually delivered within 3-4 working days
£13.80

Excl VAT

In Stock: Usually delivered within 3-4 working days
£18.30

Excl VAT

£22.90

Excl VAT

In Stock: Usually delivered within 3-4 working days
£27.40

Excl VAT

Usually delivered in 8-10 weeks
£31.90

Excl VAT

Special Order. Usually delivered within 3-4 working days
£36.50

Excl VAT

£41.10

Excl VAT

£45.70

Excl VAT

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I need m2 of Gutex Multitherm
  • Product Overview
  • Technical Details
  • Installation guide

Main purpose

External insulation, thermal bridge reduction and windproofing of timber frame and Cross Laminated Timber (CLT) walls and roofs

Use it on

Use on the exterior side of timber frame walls and direct to Cross Laminated Timber, 60mm thickness and above can be used on on pitched roofs (at least 12° pitch and in conjunction with pro clima Solitex Plus). Can also be used internally on the underside of rafters and on studs in timber frame buildings (plaster board can go on top).

Overview

Gutex Multitherm is a breathable insulated sarking board made from recycled wood chips. It is windproof, repels water and is used externally on timber frame and CLT walls and roofs. It provides excellent warmth in winter and prevents overheating in summer. It reduces thermal bridging, has excellent acoustic reduction properties and is carbon negative due to the absorbed carbon in the wood chips being greater than the carbon emissions of manufacturing.


Where to use it

Over studs on the exterior side of timber frame walls and on top of rafters on pitched roofs (at least 12° pitch and in conjunction with Pro Clima Solitex Plus breather membrane). It can also be used internally underneath rafters or over studs in timber frame buildings. When used internally plaster board can go on top. It can also be directly installed to external Cross Laminated Timber walls.  Multitherm is non-load bearing.

What it does

Gutex Multitherm provides high levels of thermal insulation in the winter and help prevent summer overheating. The boards also provide an external windtight barrier due to their close-fitting tongue and groove edge profile. Since Multitherm is mainly used over the external face of timber, thermal bridges that cause heat loss through the timber are eliminated.  

Gutex Multitherm can be exposed to the elements for up to 4 months during construction to protect the structure underneath from the effects of hail and wind driven rain before the roof or walls are fully completed.

Why we love it

Gutex Multitherm wood fibre insulation board is an excellent multi-faceted  insulation product. It provides excellent thermal insulation in the winter, reduces summer overheating, eliminates cold bridging through timber, is breathable and can be used as temporary weather protection during the construction phase.


Features

  • Excellent thermal conductivity and mass  
  • Interlocking tongue and groove
  • Vapour open
  • Environmentally friendly and sustainable 
  • Carbon negative
  • Woodfibre from renewable forest sources 
  • Chars rather than burns
  • Fully certified 
  • Natureplus certified

Benefits

  • Insulates and stores heat making the building warm in winter whilst protecting from overheating in summer.
  • Tongue and groove edges make a tight connection between boards, providing wind and water tightness. 
  • Reduces the risk of interstitial condensation and mould growth, minimising the risk of structural damage.
  • Carbon negative. Manufactured from renewable timber that has absorbed and sequestered more carbon than is produced during manufacture. 
  • Offers up to 90 minutes charring rather than explosive flash fire. 
  • Complies with building and environmental standards.

Questions

There are currently no questions and answers published for this product

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Technical Details

Key Technical Data

1.0092 m²
1.74 m
580 mm
40 mm
1.76 m
600 mm
Externally, Internally
Tongue and groove
E
0.040 W/mK
1.0 m²K/W
Moisture management, Preventing condensation and mould, Thermal insulation, Wind/Weatherproofing
5.91 kg
0.16 m
100 kPa s/m³
Yes
Natural wood
Cross Laminated Timber (CLT), Prefabricated (off-site manufactured) timber frame, Timber frame
140 Kg/m³
Exterior side of external walls, Roofs, Walls (timber frame), Walls with closed timber cladding (no gaps), Walls with open timber cladding (35-50mm gaps ), Walls with open timber cladding (up to 35mm gaps )
Recycled wood chips, Sustainable FSC/PEFC timber
4 .
2 kg/m²
2100 J/kg K
Cover and protect from rain

Technical Datasheet

Material Safety Datasheet (MSDS)

Certification

Environmental Product Declaration (EPD)

Declaration of Performance (DOP)

System Brochure

Brand/Manufacturer Brochure

Installation Guide

How to Install on a wall

Gutex Multitherm wood fibre insulation boards should be temporarily fixed into timber studs/rafters using thermal broken screws. A breather membrane is then installed over the top of the boards if required, this may be pro clima Solitex Fronta WA or Solitex Fronta Quattro or Solitex Fronta Humida

Once all the boards have been installed and covered with membrane if necessary, they can be permanently fixed using screws. This is achieved by screwing through counter battens, Gutex Multitherm and back into the timber studs.

Screws should be fixed perpendicular to the counter battens (known as suction screws) and additional screws should be fixed at 60° to the counter battens (known as shear screws).


Multitherm used on a CLT frame between Pro Clima DA and Quattro membranes
Multitherm used on a CLT frame between Pro Clima DA and Quattro membranes
Solitex Fronta WA breather membrane covering Multitherm boards
Tescon Vana Tape used on butt joints of Multitherm boards, primed first with Tescon Primer RP. Boards are temporarily fixed in position with thermally broken screws.

Where Multitherm is applied on walls without a breather membrane, all joins (butt joints) must be primed with Tescon Primer RP or Tescon Sprimer then taped with 150mm Tescon Vana airtight tape.


How to install on a pitched roof

60mm thickness Multitherm and above can be used on pitched roofs (at least 12° pitch) but must be covered with a suitable breather membrane like Pro Clima Solitex Plus.

Gutex Multitherm installation on a pitched roof where tongued and grooved joints are tightly fitted together
Gutex Multitherm installation on a pitched roof where tongued and grooved joints are tightly fitted together
Initial installation of Multitherm on a pitched roof
Initial installation of Multitherm on a pitched roof
Multitherm to a pitched roof temporarily restrained with timber battens and mechanical fixings
Multitherm to a pitched roof temporarily restrained with timber battens and mechanical fixings
When using Multitherm on a roof, it must be covered with a breathable membrane
When using Multitherm on a roof, it must be covered with a breathable membrane
For ease, Solitex Plus Connect is being used on this Multitherm roof
For ease, Solitex Plus Connect with an integrated adhesive strip is being used on this Multitherm roof
Multitherm Insulation, Solitex Plus Connect Membrane and then battened and counter-battened ready for slates
Multitherm Insulation, Solitex Plus Connect Membrane and then battened and counter-battened ready for slates

Hints & Tips

The product should be stored under dry conditions with the printed side facing externally towards the elements. The board joints should be butted (joined together) tightly, and the counter battens fixed immediately after fixing the boards.

In the following video, more tips are discussed. It includes how and when to stagger corners and how to fit the final row under the eaves without damaging the boards.

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