Green Building Forum - Insulating 60s timber frame

Insulating 60s timber frame

Peter Clark — Sun, 19 Sep 2010 16:36:08 +0100

I am having to rethink this, time, money, convenience, winter coming etc.

Thinking about Evan's proposal to work from the inside. How would you insulate between the studs and on the inside of the studs, while retaining the existing outside arrangements?

I am thinking of flexible woodfibre insulation push fit between the studs and something dense on the inside, woodfibre board, or dense acoustic rockwool in between battens and plasterboard?

My concern is that if i take off the plasterboard inside and put insulation between the studs, and then something on the inside, I will be cooling the exterior of the studs and the cladding, so more condensation likely. It has lasted 50 years quite well but really if I make this change i ought to have a ventilated cladding arrangement and/or a vapour barrier inside?

Your thoughts are welcome, pic below (from the outside).

Peter

Insulating 60s timber frame

tony — Sun, 19 Sep 2010 17:16:59 +0100

I would extend the sill with an ali profile or good wooden one then add insulation over the studs and then breather paper and refix the cladding

I wouldn't worry about upping the insulation internally so long as you use a vapour barrier inside. The brick piers are convenient for hiding the extra thickness of insulation outside.

Do you an internal skin or is the wall only 100mm thick?

Insulating 60s timber frame

Peter Clark — Sun, 19 Sep 2010 17:27:46 +0100

Posted By: tonyI would extend the sill with an ali profile or good wooden one then add insulation over the studs and then breather paper and refix the cladding

I wouldn't worry about upping the insulation internally so long as you use a vapour barrier inside. The brick piers are convenient for hiding the extra thickness of insulation outside.

Do you an internal skin or is the wall only 100mm thick?

Thanks Tony

The wall here is 4 inch studs with plasterboard and skim on the inside and tarry stuff and cladding out as in pic.

External is to difficult for me at present, too many things to arrange and pay for, scaffolding etc.

For between studs and internal insulation of this wall what would you do? What materials?

Peter

Insulating 60s timber frame

tony — Sun, 19 Sep 2010 19:18:55 +0100

Inside I would go 100 PUR or XPS or EPS in front of studs then vapour barrier then lining. I would leave the fiberglass where it is.

Insulating 60s timber frame

Peter Clark — Sun, 19 Sep 2010 19:24:11 +0100

Posted By: tonyI would leave the fiberglass where it is.

I had thought that having access to the stud cavity would be an opportunity to massively up the insulation, the stuff that is in there is about 2 inches thick.

Insulating 60s timber frame

tony — Sun, 19 Sep 2010 19:46:01 +0100

Looked like it was full to me sorry.

Insulating 60s timber frame

Timber — Sun, 19 Sep 2010 20:01:39 +0100

Personally (and some might think my aproach is too cautious but here is what I would do.

If it is IMPOSSIBLE to remove the bituminous felt and direct applied cladding I would consider installing 25 x 25 mm battens to the sides of the studs up against the felt and then install rigid insulation (I know what I normally say) between studs. This will create a 25 mm void that you can introduce ventillation from the outside in to.

You can then add as much insulation to the inside as you can/want and then install a vcl and wall linings.

Without the ventillation, the felt becomes too cold (because of the extra insulation) and you might cause a condensation risk. This way you can leave all of the outside alone but still minimise risks.

Insulating 60s timber frame

Peter Clark — Sun, 19 Sep 2010 21:47:15 +0100

Posted By: Timber
If it is IMPOSSIBLE to remove the bituminous felt and direct applied cladding I would consider installing 25 x 25 mm battens to the sides of the studs up against the felt and then install rigid insulation (I know what I normally say) between studs. This will create a 25 mm void that you can introduce ventillation from the outside in to.

You can then add as much insulation to the inside as you can/want and then install a vcl and wall linings.

Without the ventillation, the felt becomes too cold (because of the extra insulation) and you might cause a condensation risk. This way you can leave all of the outside alone but still minimise risks.

Thanks Timber,

We have had similar thoughts. Practically speaking, there are about 30 or 40 stud 'spaces' to fill with a lot of 25mm battens, I wonder if it would be possible to stick the rigid insulation to the inside 75mm of the studs? Is there a suitable adhesive?

Peter

Insulating 60s timber frame

Peter Clark — Fri, 15 Oct 2010 14:23:19 +0100

Posted By: tonyI would extend the sill with an ali profile

Hi Tony, or anyone, where could I get aluminium window sill extensions?

Peter

Insulating 60s timber frame

Timber — Fri, 15 Oct 2010 21:18:16 +0100

Peter - I guess you could do that. I think Celotex do a metal z clip that can be used to fit insulation to the inner face of the studs or rafters which may compliment a sticky solution.

Insulating 60s timber frame

tony — Fri, 15 Oct 2010 21:41:30 +0100

My local metal fabricators will make (fold) to any profile

Or buy a standard black, white or brown ali one and spray it the colour you want

they are readily available in central and northern Europe too.

Insulating 60s timber frame

Peter Clark — Sat, 16 Oct 2010 12:39:38 +0100

Posted By: tony
Or buy a standard black, white or brown ali one and spray it the colour you want

Thanks Tony, i have spent a bit of time googling and phoning, no one is able to sell me these, where could I get one?

Peter

Insulating 60s timber frame

reefray — Sat, 16 Oct 2010 13:01:54 +0100

Posted By: Peter ClarkHi Tony, or anyone, where could I get aluminium window sill extensions?

Peter

Peter these guys could be an option. I found them very helpful.

http://www.wemico.com/products/sills-flashings.html

Ray

Insulating 60s timber frame

Peter Clark — Sat, 16 Oct 2010 15:47:17 +0100

Posted By: reefray
Peter these guys could be an option. I found them very helpful.

http://www.wemico.com/products/sills-flashings.html" rel="nofollow" >http://www.wemico.com/products/sills-flashings.html

Ray

Brill, many thanks reefray.

Peter