Should we construct our home using SIPS or CLT panels?

We are looking to build a timber frame chalet bungalow and my architect is talking about using structural insulated panels (SIPS). However, I recently saw cross laminated timber (CLT) boards being used on a TV show.

I’m unsure which would be better for my project. I’d like to have a timber finish for the internal walls upstairs, but will probably plaster most of the ground floor. How do these systems compare in terms of cost and insulation?

Both systems would be appropriate in your case. Where you want to see the timber as a finish then CLT would be an obvious solution, as the SIPS will need to be clad to achieve this result. SIPS and CLT are off-site manufacture methods of building. ey have been in use for many years now, although the latter is a relative new-comer to small scale residential projects.

Both options involve fabricating the structural element of your external walls in large panels that are craned onto site and connected together. So they represent a quick and efficient way to erect your new home and reaching watertight stage.

In terms of thermal performance, both systems will achieve the kind of insulation and airtightness you need in a modern home. However, you should ask your architect to look into the relative thicknesses of each solution to achieve the same performance level and whether they correspond with the wall zones you have shown on your design so far.

Where the CLT is seen internally, you’ll need to plan your electrical and mechanical fixings very carefully, as you’ll want sleek looking panels. You can read about John Kinsley’s experience using CLT at www.self-build.co.uk/kinsley.

ere are many SIPS suppliers out there but far fewer CLT firms. I would suggest you send the plans to relevant companies to get comparable pricing in thorough detail and ascertain which building system is going to suit your scheme better.