How should I fix insulation boards between rafters?

[thesheep]

We have a very large loft space that I've floored out and have cut 70mm celotex to fit between the rafters, with 50mm breathing space (we also have new breathable felt).

At first I thought the boards would just stay in place, but I guess the drop in temperature is affecting the wooden rafters and the boards have started falling out.

What's the best way to fix them in place? I see Celotex do some tape (http://www.toolstation.com/shop/Con...Insulation+Tape+48mm+x+50m/d210/sd2738/p32233) but I'm not sure if this is any different from the Aluminium tape I got from Screwfix (http://www.screwfix.com/p/no-nonsense-aluminium-foil-tape-silver-72mm-x-45m/50629) which is a bit wider. I also tried putting some screws in which works but probably better to seal any small gaps too.

Does it really matter what tape? Could I just use duct tape instead?

 

[tony1851]

Do you intend lining the underside of the rafters (eg with plasterboard)?
If so, the boarding will hold the panels in place, so the tape would only need to be a temp. fix.

 

[thesheep]

Do you intend lining the underside of the rafters (eg with plasterboard)?

Good point. Eventually we will plasterboard it, but it may stay as it is for a few years, until we have the money to finish it into a living space. So really I need a solution that is fairly robust, as it will need to stay in place for a good while before the plasterboard is added.

 

[catlad]

There are special plastic insulation clips that go in the side of the celotex then you can screw it into the rafters.

 

[thesheep]

There are special plastic insulation clips that go in the side of the celotex then you can screw it into the rafters.

Interesting. Do you mean these: http://www.toolstation.com/shop/Con...elotex+Plastic+Rafter+Clip/d210/sd2738/p44294?

 

[catlad]

Yes

 

[thesheep]

Great, thanks. I have ordered some!

 

[joe-90]

You'd have been better fixing the plasterboard up instead of wasting money on clips. So you are going to look at a load of insulation board for years?

 

[thesheep]

You'd have been better fixing the plasterboard up instead of wasting money on clips. So you are going to look at a load of insulation board for years?

It is a very large space and eventually will be divided into 2 rooms and a hallway. So I can't really add the plasterboard before I put in all the internal walls. Yes I know I could do that too, but I have to stop somewhere and the money has run out! Plus I want another layer of insulation eventually.

For the next few years I will use it for storage and maybe put a ping pong table in there

Plus, I kind of like the look of insulation boards in a strange way.