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Gutex 5in1
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Product Overview
Main purpose
External or internal insulation, thermal bridge reduction and windproofing of timber frame and Cross Laminated Timber (CLT) walls, roofs and floors.
Use it on
Timber frame or CLT walls externally behind a vented rainscreen facade. On pitched roofs with a slope greater than 12° covered with Solitex Plus / Solitex Plus Connect (minimum 60mm thickness). On sloping ceilings internally on the underside of rafters. On internal walls (as service cavity insulation). And on solid floor slabs under a screed.
Overview
Gutex 5in1 is a vapour open (breathable), multi-purpose wood fibre insulation board made from recycled wood chips. Its adaptability makes it ideal for 5 different external or internal applications on walls, roofs and floors. Beyond its thermal performance, Gutex 5in1 offers excellent acoustics and low embodied carbon, thanks to its natural materials and manufacturing process. It keeps buildings warm in winter and cool in summer while minimizing thermal bridging.
Where to use it and what it does
- Gutex 5in1 is a multi-purpose insulation board. The main use cases are:
- On pitched roofs of at least 12° pitch (as insulated sarking) with Pro Clima Solitex Plus or Solitex Plus Connect weatherproof membrane. Allows for up to 4 months weather exposure temporarily during construction. 60mm minimum thickness.
- On timber frame or Cross Laminated Timber (CLT) walls as external insulation under a ventilated rainscreen facade. 4 months weather exposure during construction. 60mm minimum thickness.
- Service cavity insulation that can be installed with or without battens. The boards can be routed to create chased out channels for cables and pipes.
- Sub floor installation on to a solid slab with screed over the top. 60mm minimum thickness.
- Internal insulation on sloping ceilings fixed to the underside of rafters. Can be directly plastered onto, or a wood wool board can be fixed over battens and then lime plastered, or plasterboard can be used.
For external use, Gutex 5in1 should have the printed side facing out towards the environment; this side provides the weatherproofing for up to 4 months exposure during construction.
Gutex 5in1 provides high levels of thermal insulation in the winter and helps prevent overheating in summer. The boards also have a close-fitting tongue and groove edge profile making them windtight and weatherproof when used externally. Since Gutex 5in1 is mainly used over timber such as wall studs or rafters, thermal bridges that cause heat loss through those timbers can be eliminated.
Gutex 5in1 can be exposed to the elements for up to 4 weeks during construction to protect the structure underneath from the effects of hail and wind-driven rain before the roof or walls are fully completed.
Gutex 5in1 is not a load bearing or structural insulation, so it will not support any structural weight. When used on internal walls, Phonotherm pattresses are required to support heavy items like kitchen wall cabinets or heavy shelves.
Why we love it
The versatility of Gutex 5in1 creates significant construction efficiencies. The five distinct application possibilities streamline logistics and reduce storage overheads, directly impacting project timelines and overall productivity.
One board used for multiple applications simplifies specifications and avoids mix-ups on site.
The integrated tongue and groove (T&G) edge profiles create a jointing system with exceptional airtightness and water resistance. This is crucial for preventing unwanted air infiltration and moisture ingress, thereby safeguarding structural integrity. As a vapour-permeable natural material, Gutex 5in1 effectively manages interstitial condensation risk, and contributes to superior interior air quality.
Tested for fire resistance (up to REI 90) and with a low embodied carbon profile, Gutex 5in1 is a high-performanceand environmentally responsible natural building material.
Features
- Excellent thermal conductivity and mass
- Interlocking tongue and groove edge profile
- Vapour open (breathable) natural insulation
- Environmentally friendly and sustainable
- Multi-purpose with five areas of application
- Made from recycled wood chips originally from renewable forest sources
- REI 90-minute fire resistance rating in timber panel systems
- Natureplus certified
- 5 application areas; saves time, reduces storage, simplifies specifications and increases productivity
- 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.
- Offers up to REI 90 minutes fire resistance rating; charring rather than explosive flash fire.
Questions
Is there any difference between Gutex Thermowall 5in1 and Gutex 5in1?
No. Gutex 5in1 is the same as Gutex Thermowall 5in1
Technical Details
Key Technical Data
Installation Guide
On pitched roofs of at least 12° pitch (insulated sarking board) Installation
Gutex 5in1 must be at least 60mm thick for installation on the roof. The roof must have a slope (pitch) of at least 12°. Install the boards perpendicular to the timber rafter or studs (i.e. horizontally for the long length of the boards), then temporarily fix them into place using thermally broken mushroom-headed screws.
When installed on a roof with a slope (pitch) of less than 15°, the Gutex 5-in-1 needs to be covered with Pro Clima Solitex Plus or Pro Clima Solitex Plus Connect breathable external membrane.
When no membrane is applied over the Gutex 5-in-1 boards, butt joints and cut edges (not utilising T&G joints) must be primed with Tescon Sprimer or Tescon Primer RP and sealed weathertight with sufficiently wide Tescon Vana airtight tape. The ridge of the roof, and any valleys, should also be primed, then taped with 150mm wide Tescon Vana airtight tape. All service penetrations should be primed and sealed air and windtight with Pro Clima airtight grommets and airtight tape as required.
Once a membrane has been installed or the joints, edges, ridges and valleys have all been taped, the 5in1 boards can then be permanently fixed by installing counter battens (vertically above the rafters or studs), then screwing through these battens into the Gutex 5-in-1 and then into the timber underneath. Heco Topix screws should be used with a setting tool to help orient the screws. The fixing patterns for the locations and directions of the screws must be obtained by contacting our technical team; they will provide the optimal fixings specification that ensures maximum safety, structural integrity and lifespan of the building.
Internal Insulation on a sloping ceilings installation
When any existing ceiling plaster or finish has been removed to expose the rafters, Gutex 5-in-1 boards can be temporarily fixed to the underside of the rafters using thermally broken mechanical fixings such as Fischer TermoFix 6H-NT. There should be typically 2 mechanical fixings per rafter per board. The screws should be long enough to go through the 5in1 board and at least 30mm into the rafters. Pro Clima Intello Plus intelligent vapour control membrane should then be installed over the 5in1 boards and stapled to hold it in place. Gutex 5in1 is firm enough and dense enough for the staples to hold firmly and remain airtight. Seal the membrane overlaps with Tescon Vana and seal the perimeter edges to masonry walls or ceilings with Contega Solido SL or Orcon F. Prime the masonry or plaster surfaces with Tescon Sprimer or Tescon Primer RP before applying the tape. Battens can then be added, held in place with short screws or staples that do not go entirely through the Gutex 5in1. Apply the Cewood or Celenit wood wool board to the battens and secure with thermally broken screws long enough to penetrate the wood wool board, Gutex 5in1, and into the rafters at least 30mm. Finish with Lime Green Solo lime plaster and natural breathable paint. Alternatively, plasterboard can also be used over the battens instead.
As an alternative to using wood wool boards or plasterboard, Gutex 5in1 can be directly plastered with Lime Green Solo lime-based finishing plaster. To avoid any movement or potential cracking over time, the Gutex 5in1 should be at least 60mm thick and have 3-4 thermally broken screws applied per rafter per board. If the sloping ceiling pitch is >30° (from the horizontal), then the maximum centre spacing of the rafters should be 400mm and if the pitch is <30 degrees (from the horizontal), then the maximum centre spacing of the rafters should be 300mm. If this rafter spacing is unsuitable or you would prefer the safest approach, a wood-based board (minimum 20mm thickness) can be fixed to the underside of the rafters, and then the Gutex 5-in-1 boards installed over that. This eliminates all movement in the rafters and prevents cracks in the directly applied lime plaster from appearing over time.
Hints & Tips
The product should be stored under dry conditions with the printed side facing outwards toward the elements.