Insulating a pre bought shed floor before assesmbly

Seafarer1966 · 29 Nov 2016

heyrob said:
Excuse the bad sketch but this roughly shows:

Piers added to existing concrete slab.
3x2 frame sitting on top of those
T+G prefab shed floor on top of that

So the only way to have it tight to the shed floor would be to insulate between the t+g floor battons.

Not a bad sketch that. You could fill underneath your tongue and groove with squirty filler. Even drill suitable holes in the t and g floor and fire aerosol filler into it at appropriate intervals to fill up the cavity. Then plug the holes (I've used car body filler for carpentry jobs as it's so much better than so called wood filler).

Like has been said already at the end of the day it's a shed and you won't be living in it. If you over-engineer the insulation it will become an over-expensive shed.

heyrob · 29 Nov 2016

big-all said:
have you put felt or dpm between the concrete and timbers to give a moisture barrier

Yes done this thanks

wgt52 said:
Why do you not put the floor section of the shed in it's final position; Lay insulation over the top of it then lay another wood floor over that, then erect the shed sides and roof finishing off by sealing around the insulation edges.

That way you maintained the air gap underneath the shed and have you insulated floor.

Would that not then raise the internal floor height or over all building height depending where you attach the shed walls

motorbiking said:
I think you are over thinking this.. you need to insulate the walls, door and roof too, I think I'd use 20-50mm celotex and cut to fit between the joists and then either clad with ply or plasterboard. The route you are going it would be cheaper and easier to buy a SIPS shed or build your own.

Given the life of a shed, its going to be cheaper to burn the extra power than recover the cost of insulation. Particularly since you will have a single glazed window ? with a U of over 5 and perhaps a door too?

You could be right, maybe this is just massive overkill, I am planing to insulate the inside at some point, clad the walls (mostly for security) and add another layer of glazing. I just thought I would take the opportunity to do the floor now. My preference would have been to build one but with the current weather, need for a shed quick, plus the likely hood of moving within 3-5 years I thought pimping a factory shed was the easier option.

Seafarer1966 · 29 Nov 2016

I mean use the car body filler to plug the holes you've drilled. Aerosol foam filler for the insulation. I just re-read that.

Seafarer1966 · 29 Nov 2016

I secured my shed against seige by track suit wearing bar stewards by internally lining with exterior grade ply and fixed with dome headed coach bolts (nuts on the interior obviously). This spec of ply lasts for years (you don't have to treat it but you could if you wanted to).
You could either line in between the ply and the shed wall with rock wool or for a firmer job use aerosol foam. Insects or mice may make nests in the former so I'd go for aerosol which is pretty much uninhabitable when it's cured.

big-all · 29 Nov 2016

whilst i would agree the payback will be poor on a short lived shed the possible damage to expensive tools or equipment will help balance out the cost along with the bearable summer cool from insulation
also a well looked after shed will easily last between 10 and 50 years

motorbiking · 29 Nov 2016

I'm a big celotex fan, I insulated my man cave with 100mm roof and walls and 45mm + 50mm poly in the slab floor, but its expensive. For this application, I'd look at loft insulation or 25mm boards tops (unless thicker boards are similarly priced).

remember that heat loss is only ~15% through the floor, 25% out the roof and 35% through the walls.

Seafarer1966 · 1 Dec 2016

I helped my grandad build a shed in 1975. He had an old tin bath on top of an oblong bonfire and had a 50/50 mix of used engine oil and creosote warming up in the bath. Timbers were either soaked in the bath or painted with the mix. It stank to high heaven and ruined me clobber but that shed is still standing 41 years later. I drive past his old council house quite regularly and see it down the back garden. Not an environmentally friendly product to use to treat a shed I'll admit but it soaked in lovely.

big-all · 1 Dec 2016

normal practice at the time like smoking and using asbestos fibers and sheets

Seafarer1966 · 1 Dec 2016

Quite. He smoked 50 Park Drive or Senior Service fags a day. He was the boilerman at a webbing tape mill hand shovelling coal into a big old boiler. He drank a gallon at lunchtime at the pub next door to the mill and after work he'd crack open his home brew. He never went to bed before midnight and got up at five in the morning. He was 96 when he died. I miss him.

diynot

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

Insulating a pre bought shed floor before assesmbly

Similar threads