Victorian house insulation

[Metalmankeith]

Hi can any one offer any advice I am renovating a victorian semdetached house I want to insulate the internal walls by fixing insulated plasterboard to the walls I intend to use foam fix and mechanical wall fixings to attach boards to walls does any one know is it best to remove existing lime plaster or leave it in place , it is in good repair not loose or damp but if I leave it will it draw damp behind boards and if I remove it will it cause problems in the wall thanks for any help or advice keith

 

[theprinceofdarkness]

If you remove the lime plaster you will have a fine layer of dust on the blocks, which is difficult to remove. I am unfamiliar with foam fix. If its expanding foam then as it expands it will force the boarding off the wall unless they are very firmly restrained.
Frank

 

[joeinlondon]

Apparently you need to cover the foam with some kind of membrane to avoid damp. I'm guessing but not clear from your question whether you intend to do every internal wall rather than those that face outside? Also try and make sure that you salvage any skirting rails picture rails etc if you don't want to devalue.

Info about damp here: http://www.superhomes.org.uk/resources/insulation-vapour-barrier/

I have just avoided except in bath room - if you do enough in the loft/ secondary glazing/ curtains it works for me. I'd rather insulate under the floorboards first and avoid damp risk - also will make the rooms smaller.

 

[^woody^]

You can leave the plaster and use foam adhesive no problem if the plaster is sound and you remove any wallpaper and clean the surface ready for fixing.

No membrane will be needed if the external wall and pointing is sound and no damp is coming across the wall. If that's not the case, you can coat the external wall with a long life clear waterproofer instead of using an internal membrane.

 

[joeinlondon]

Though using a waterproofer on old bricks will trap any moisture in them causing damp they should be permeable and able to breathe https://www.spab.org.uk/downloads/Courses 2011/LDN HOW - Breathablility and Damp- Davids Version.pdf

 

[^woody^]

Though using a waterproofer on old bricks will trap any moisture

Only if the wrong type is used. The proper ones are breathable.

 

[Deleted 224857]

Though using a waterproofer on old bricks will trap any moisture

Only if the wrong type is used. The proper ones are breathable.

Woody would you please quote some please

 

[^woody^]

www.watco.co.uk/media/products/technical/watco_ie/XMW5_DS_1.pdf 20-30 years expected life

www.twistfix.co.uk/silane-water-repellent-facade-cream - 15 years expected life

Sika Liquid Plastics K501 – at least 10 years life www.promain.co.uk/product/liquid-plastics-k501-id3202

 

[Metalmankeith]

Thanks for your input will probably try removing a section of plaster to see what walls are like and then insulate using polystyrene backed plasterboard fixed with nonexpanding foam I've been told to try to leave air gaps along top to allow wall to breath not sure about that but boards will be fixed dot and dab style any way will let you know how I get on thanks

 

[AronSearle]

Read...

https://content.historicengland.org...-solid-walls/eehb-insulating-solid-walls.pdf/

Has everything you need.

If you leave a cavity behind the insulation (typically not required), then this cavity should be vented to the outside, not the inside (as otherwise you just compromised your insulation).

And you need a vapour control layer on the warm side of the construction as shown in the above document.

 

[noseall]

And you need a vapour control layer on the warm side of the construction .

Yes, directly behind the plasterboard.

 

[AronSearle]

Nice bait noseall.

It has to be on the warm side, you can have a service void in front of it, or it can be directly behind the plasterboard.

If you wish to continue the other thread where you ignored all the standard details that show this, please do so.

And like the other thread, no, I will not educate you, do it yourself.

 

[noseall]

And like the other thread, no, I will not educate you, do it yourself.

You need to educate yourself first.

 

[Metalmankeith]

Thanks Aron the link to historic England was very useful and will follow its guidelines many thanks for your help in this Keith