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new workshop - insulation advice needed

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mattinker:
I've mentioned this before, I used fridge truck (-18°C) insulated panels that I got free from an industrial body builder specialised in Freezer trucks! When an insulated truck tries to get under a bridge that is too low, it wrecks the front, but they have to replace whole panels, leaving a lot of reusable material. The walls are 50mm and the roofs are 80mm. It cost them to have the stuff destroyed! Unfortunately, I don't have any UK contacts for this, but, for large surfaces, (like tractor sheds Andrew!!) it could really be worth while! The attached photo is the North wall of my workshop, with double doors 4m high X 2x2m wide with a "pophole" 2.2m x1m which is my front door! The strap anchors are still in place as the are a real pain to remove. The lower part of the Truck sides are cover with stainless sheet, an added bonus!

Regards, Matthew.

picclock:
@ mechman48
You said 1" insulation and a 1" gap. Is it necessary to have a gap? or does it provide some other advantage?. Would it be better to have no gap and just use 1" thick studs?

I don't understand why the wall insulation is so expensive. It appears that the insulation could cost more than the osb.  Loft insulation is cheap as chips and presumably(?) would be equally suitable once fitted in place- or maybe not. I have no clue about this stuff :scratch:

Many thanks for the info.

Best Regards

picclock

awemawson:
I used 18 mm OSB3 (the 3 denoting survives in moisture!) for lining the walls of my barn - had to do something as they were sprayed with expanding foam 75mm deep. The 18 mm OSB means I can fix shelves and cupboards, wiring, plumbing etc wherever I want which is really handy. I sprayed it all with white emulsion to get the light levels up a bit.

mechman48:
I assume the gap is to provide a form of moisture barrier; the builder who did mine explained that instead of a vapour barrier (polythene sheeting) next to the wall the gap has the same effect...Plus the foil on the inside of the Celotex... so he says... :scratch: I s'pose you could use loft insulation in between your studding, the space blanket expands from 3/4" (shrink wrapped) to 4" expanded, & being enclosed in polythene will have same effect...  :thumbup:

George.

hermetic:
 Just on with My workshop at the moment, I am using 25 x 50 treated battens (roofing lath) at 600mm centres with 50mm polystyrene, followed by a visqueen DPM and 3.5mm plywood, which will get a couple or thre coats of washable emulsion The lining is thin, but any shelving can be fixed to the battens!

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