Insulating Garage Ceiling

[philt89]

Hi,

This is about the same garage as my previous post but didn't feel this was in any way related.

My garage is attached to the house and has a flat roof. It has been split in half with a stud wall when our kitchen was done. I want to insulate the ceiling in the remaining garage area but I don't want to board directly onto the joists. I'd like to leave the joists almost like exposed 'beams'. This is purely for my man cave and will be keeping the up and over garage door in place.

My current plan is to use insulation roll like the Knauf stuff from Wickes and then OSB fixed onto batons to keep everything up and hidden between the joists.

My concern is condensation from lack of ventilation. Do I need to fit a vent in somewhere and make sure to leave an air gap between insulation and flat roof? Or will the insulation help to stop anything like that from being a problem?

Cheers

 

[DAZB]

Assuming you have a soffit around the flat roof then vents can be fitted into the soffit to introduce ventilation to the recommended 50mm roofspace above the insulation. If you have no soffit then external vents can be fit to the flat roof surface, a bit like a mushroom, but to ventilate it all will need several and cost a few bob in labour if you employ a tradesman. This link gives you some idea...

How much ventilation does your Flat Roof Need | JJ Roofing

This blog will discuss the importance of flat roof ventilation and how an insufficient ventilated roof can be a short trip to a roofing catastrophe. Read More!

www.jjroofingsupplies.co.uk