Workshop - block or wood ? humidity worries..

[Bushman]

Thank you for all your replies. Very informative and helpful.
I'm edging towards the wooden shed now. I have been thinking how to play the back wall. End of my garden looks lik this:

I was wondering if I should put DPM on the back wall before I put 2x2 , fill it with insulation and then OSB?
Would something like the drawing below work ?

 

[Lockyear2810]

I would build the wall off the back by about 3” 75mm.
Put some stops into your frame to put some 2” 50mm insulation in the front part of the frame, leaving an air gap to the brick wall.
Fill around the insulation using an expanding foam gun.
Then put a vapour barrier over the inner edge for belt and braces.
That will stop any warm air passing through and hitting the cold brick wall.

Also don’t sit your workshop on a large concrete plinth.
Make the plinth a tiny bit smaller so the wooden sides can just overlap the edge of the plinth.
That way all the water will run off the building onto the ground.
With a large slab it will run onto the top of the slab and just sit there.
Eventually rotting through your floor bearers.

 

[johnny]

Do you have any idea of the ratio of time on v time off?
Assuming it switches automatically

I'm pretty sure its on continuously, its an uninsulated unheated diy garden shed.....but it has a tiny fan motor so a negligable current draw in mw

 

[Jameshow]

Thank you for all your replies. Very informative and helpful.
I'm edging towards the wooden shed now. I have been thinking how to play the back wall. End of my garden looks lik this:
View attachment 95499


I was wondering if I should put DPM on the back wall before I put 2x2 , fill it with insulation and then OSB?
Would something like the drawing below work ?

View attachment 95500

That looks a reasonable way to proceed.

Why do you need s concrete floor if your a hobby woodworker?

Unless your wanting very heavy old style machines then 18/22mm chipboard flooring over 50mm insulation will be warmer and cheaper.

Cheers James

 

[DBT85]

Upon what would the insulation sit? It's rigid and needs a flat surface.

 

[XH558]

Here is some info on timber frame construction. Hope this helps but personally I would avoid block walls unless you provide a moisture barrier to prevent moisture being drawn into the the building. Tyvek is a great product. ~Then batten the walls then clad~

https://www.space-wood.com/en/wooden-structures/prefab-kits