To discuss your project give us a call on 01392 861763

Sustainable Building Forum

The place to share best practice advice about all things sustainable building. Use the search icon to find the topic you’re interested in or register as a member to comment on topics and ask your own questions.

Notifications
Clear all

How would you insulate in and around a structural oak timber frame?

 
Chris Brookman
(@chris)
Member Admin

With traditional Oak or Douglas fir frames the frame does all of the structural work and so the infill panels are largely just that, infill. However, this doesn't materially change the way in which they would be built up from our standard suggestions, which you can see below. The main difference is that you need to wrap the structural frame with the VCL membrane so that as this frame shrinks you do not open up huge air gaps. This takes time as there is a lot of cutting and taping of the membrane around the timbers and junctions, etc. and this should be brought round to finish flush with the internal faces of the timber frame.

Once the membrane is installed, the softwood panels and rafters can be installed in the appropriate positions and the membrane lapped on to the inside faces of these panels/rafters. This can then be taped to the air tightness layer on the inside of each section.

In terms of minimum build-ups for the panels in the walls I'd suggest the following:-

This will achieve a U-value of 0.177 W/m2K which would be required by building control.

For the roof I’d suggest the following:-

This will achieve a U-value of 0.134 W/m2K which will just pass through building regs.

Hope that helps.

Quote
Topic starter Posted : 11/03/2021 11:59 am
Share:

CPD Training

We offer CPD training for architects practices across Devon and Cornwall.

Software Modelling

We offer dynamic heat and moisture modelling as well as condensation risk analyses.

Building Plan Review

If you have some plans and would like our opinion on which materials would be the best for you, contact us.

Overview

Back to Earth is a natural building material supplier. We're not your typical builders'​ merchant though and instead work closely with our clients during the planning, designing and building phases of projects.

© 2018 Back to Earth