Garage insulation

[Westonp]

Sorry if this had been asked before but I'm getting a lot of different answers to this question.

I have a double garage, separate to the house with a pitched roof. The rafters are partially boarded out for storage. The walls are painted and the floor is sealed and painted.

I need to insulate the garage for a number of reasons mainly to stop items being ruined through rust or mould but also to stop the floor becoming very slippy/wet.

I have a heater in there but with there being no insulation in the roof it's just pi**sing out the roof.

Would attaching the foil insulation to the roof beams, not rafters. Sort this issue out or create more condensation. Any other ideas. Would like to keep the cost down as much as possible.

Manu thanks

Mike

 

[catlad]

Am I correct in thinking you have no ceiling and its cold? if that is the case then build a ceiling and insulate it.

 

[Westonp]

Sorry to ask a daft question but what's the benefit of creating a ceiling and insulating it over insulating just the roof?

 

[cajar]

Air gap provides insulation like double glazing does.

 

[Alastairreid]

Attaching insulation to the rafters would be fine as long as you maintained a vented air gap between the insulation and roof covering.

Sounds like you need to vent the garage as well, what are you using to heat it?

 

[catlad]

You will be heating X cubic metres of space that does not need to be heated and your garage will be warmer.

 

[Alastairreid]

just re-read this!

Attaching the insulation to the ceiling wont stop the condensation in the garage! you need ventilation.

And you would still have moisture dripping down from rafter level.

 

[Westonp]

just re-read this!

Attaching the insulation to the ceiling wont stop the condensation in the garage! you need ventilation.

And you would still have moisture dripping down from rafter level.

That's what I was fearing.

Would a decent dehumidifier be a better investment?