Workshop insulation

[bertikus_maximus]

Hello all - long time lurker emerging!

As I'm sure is true for the rest of the UK, the weather has taken a sudden cold turn today (5 degrees presently) and it's got me thinking about insulating my workshop. Having never done this before, I thought I'd see if anybody has any tips/advice etc.

My workshop is in fact an attached garage to my house. My house was built in 2012, so I understand that the roof has a breathable membrane of some sort already (?). Additionally, my garage is attached to my neighbours garage (essentially, it's our house, our garage, their garage, their house). This means that two walls are 'cement blocks' with one wall being red brick.

Clearly, I need to couple any roof insulation with some draft exclusion on the door (I pretty much have this covered) but I also don't don't want to have problems with condensation either from lack of airflow.

So, does anybody have any tips, advice, links etc that I could have a look at so I can start planning?

Thanks for your help! (hammer)

Bert

 

[woodpig]

I've had several garage workshops and the only one that had condensation problems had lots of air gaps around the corrugated roof and the door. Insulating your roof and sealing the door should make a big difference. If it's still a bit cold then stud work and insulation on the walls would be the next step. Plain concrete floors are also not very kind to your feet this time of year so applying some kind of covering can make a huge difference to your personal comfort. If you can run to it a painted plywood floor is a good option.

 

[Wuffles]

This ^^

And, do you have a Magnet Trade account, or know someone who has? You'll be wanting to buy a fair bit of Celotex insulation for that space and they're about the cheapest for that right now, cut it accurately and cram it in the ceiling timbers for a kick off - a picture of the space would help to describe where you put it. Presumably you're a tiled roof, so you don't want to be pushing rockwool or anything up there and touching the membrane as I believe it will "sweat".

Doubt you'd get condensation on a tiled roof, so you're lucky in that respect. Cost me £2k to spray foam the underside of my corrugated workspace/family games room. It was like a waterfall in there on a sunny frosty morning.

Happy to help with contacts if you like as you're just up the road a bit from me.

 

[woodpig]

Yes, I'd go the Celotex route. Travis Perkins are also pretty good on price for building materials but you'll have to pop in or phone them for a price.

 

[RobinBHM]

I tend to buy ecotherm, generally find it cheaper than ecotherm.

Seconds&co have good prices, but their boards can vary in thickness.

 

[DennisCA]

The way I insulated my garage was with rock wool, 150mm of it, then a moisture barrier and finally interior drywall, later I will put 500mm of insulation on the roof, there will be a cold attic over this. I will put vents in each room, one low for incoming air and one high for outgoing air, the heated areas will have radiant heater placed near the incoming air. As long as I can get it 5C and relatively dry in my main workshop without too much expense I will be happy. The door might need additional insulation though, I haven't really looked at it, it's a big car port still in its packaging.

This might be somewhat excessive for the UK climate, but maybe I've given some ideas or hints.