# Wood fibre insulation over wooden beam **URL:** https://community.carbon.coop/t/wood-fibre-insulation-over-wooden-beam/1133 **Category:** Home Retrofit **Created:** [22 January 2026 08:39 UTC](https://community.carbon.coop/t/wood-fibre-insulation-over-wooden-beam/1133 "2026-01-22T08:39:53Z") **Posts on this page:** 1 **Showing post:** 27
### Author: ![Christian\_Unger](https://community.carbon.coop/letter_avatar_proxy/v4/letter/c/919ad9/32.png) [@Christian\_Unger](https://community.carbon.coop/u/Christian_Unger) #### Post date: [19 March 2026 19:30 UTC](https://community.carbon.coop/t/wood-fibre-insulation-over-wooden-beam/1133/27 "2026-03-19T19:30:40Z")
Hi all, I have been to Wormesleys again and got myself some 20mm and 40mm boards after trying with the off cuts from Ellis. Also bought a bag of Lime Green Duro and Lime Green Solo to try out the Warmshell system. > **[Natural internal wall insulation | Warmshell IWI by Lime Green](https://www.lime-green.co.uk/warmshell-natural-insulation/warmshell-internal-insulation)** > > Warmshell is a natural internal wall insulation/IWI system using breathable woodfibre and lime. Suitable for solid walls, retrofit and eco friendly new builds. So basically I have now pointed most of the wall with NHL3.5 mortar and the next stage would be parging the wall to level it and make it airtight, for which I am thinking to use Lime Green Duro (Which I think is an NHL3.5 based plaster). Then to stick the woodfibre boards onto the wall you seemingly have to apply another adhesive (Warmshell Board Adhesive, which is also lime based) and mechanical fixings. Finally, lime green solo as a finishing plaster applied in two layers, with the first one having a mesh. Can I ask if anybody here (or in the forum in general) has tried this system or any other woodfibre board system and could potentially advise on practical matters? @Tim_Gilbert @sianrichards55 @School_of_Natural_Bu @pottyone72 @zapaman (Sorry, just tagging a few members that have posted about lime and woodfibre. Hope that is ok and thanks for any advise). Thank you. --- _[View the full topic](https://community.carbon.coop/t/wood-fibre-insulation-over-wooden-beam/1133)._