What structural solutions make Touchwood Homes so efficient?

We specialise in pre-cut frames, rather than restricting our designs to fit a factory panelised system. This allows us to design homes to any shape, including curved walls, always airtight to the PH standard. It also means we do not need a crane on site to erect the structure or many lorry loads of panels –  a distinct advantage on sites with poor access.

The home structure is created from our superior 300mm thick I beams allows for a very fast build time. The i-beam composition creates a purposeful void that is designed to contain our cellulose fibre insulation.  When the frame erection has been completed on site,  the cellulose fibre insulation is mechanically pumped into the void to an extremely high density which lesser quality twin walled builds would not be able to withstand. Once complete, you have a well insulated building which will incur minimal heat loss occurring through its thermal envelope.

Constructing from I beams, rather than solid timber, also results in minimal cold bridging through the walls because there is minimal solid material crossing the building’s thermal envelope, which when coupled with insulation and airtightness results in a frame that will meet the Passivhaus standard.

The entire structure is then then externally sheathed with an air tight, solid TG fibre board to provide a completely robust, long term air tight solution which much more robust than the traditional use of sticky tapes and membrane!

Foundation diagram

Insulation diagram

Eaves diagram


Effective insulation

Cellulose fibre insulation is pumped into the walls and roof. With I beams walls much higher Warmcel densities can be achieved vs cheaper twin wall systems, resulting in a better thermally performing home.


Preventing Drafts

We cover the entire external surface of the build with our TG board, mastic sealed at all joints to form a long term robust air tight layer. We do not use cheap tapes and membranes.


Combating Cold-bridging

I beams have only the 9mm web passing through the structure, so minimal cold bridging occurs.

 Another feature is that, rather than using “cheap” traditional trusses for our roofs, we use glulam ridge beams which primarily creates a simplistic airtight layer following the external side of the building, omitting the complexity of having the airtight layer duck inside the roof at eaves level.

Glulam ridge beams also allow the roof space to be completely open, giving the attractive option of dramatic vaulted ceilings.