Insulating shed (VCL)

21 Oct 2014
Reaction score
West Midlands
United Kingdom
I’m aware there is a garden section, but this in my humble opinion is kind of building related..... maybe

I’m planning a second 12’x8’ shiplap shed and having both as a workshop. Plan on insulating with 50mm of EPS between the framing then fixing OSB on the inside.

If I were to build the new shed to gold standards, working from the outside would go - shiplap, battens, breathable membrane, osb, stud work with insulation between, vcl, osb.

retrofitting insulation to my old shed is going to be trickier to adhere to this. What would be the problems with sticking 50mm EPS between the 2” studs right up against the outside shiplap, adding a VCL on the inside then OSB over the top. I’m doubting the shed would immediately explode, or disintegrate in 6 months, but is this proposal OKish?
Sponsored Links
I'd be tempted to build a treated stud wood frame at 600mm intervals and then clad with t&g treated facia. then add one half of a 50-75mm celotex panel in between and use plasterboard on the inside. the insulation is foil backed and if you give the t&g a couple of coats of treatment it won't leak. You can repeat for the roof and use OSB and 2-3 layers of roof roll to waterproof.

a mini version of this

I’d love to use celotex but my budget will not allow. EPS is not as efficient but a quarter of the price. Thinking about it, how much warm, moist air could get through the EPS and condensate on the inside of the T&G. That is hardly airtight so can the evaporate.....
I can’t see that being a problem for at least 10 years.
Sponsored Links
**** your shed. How’s your driveway doing a few months on?
Here’s a couple of pics when it was just done. All planted up posh like now.

Now the house is as good as done, this leopard is changing his bodge-a-job spots. Hence the shed workshop question. Today Matthew, I have decided to be a master craftsman. Of what yet I’m not sure


DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local