[Closed] Cavity wall insulation in an old house?

We have a few cavity wall people on here I remember. Sit it out!

Adding insulation changes the dew point location within the building fabric and can cause problems.

I've umm'd and arr'd about this one myself

as yet not had it done as I've been worried about the same problems too

I think it's known as 'Bridging'
My place is about 100 years old too and the old style bricks are pretty porous

I've got a friend who had it installed (again an old house) and ever since he's had a damp patch on a ceiling in one of his bedrooms apparently it grew out of the corner of the room by the extrnal wall the winter after he had cavity wall insulation put it.

don't do it,

I own a 100 year old house and use this site for that kind of info,

www.bricksandbrass.co.uk

basically, if you block the wall cavity the house won't get the air it needs to get rid of moisture, we have 3 foot underneath our ground floors and around 50mm in the walls plus air bricks on all the outside walls.
if you fill the cavitys you will get big problems with damp as all the moisture will get trapped insdie you inner walls, mould city...we have a lot of drafts in the winter and the house can feel cold, but we just light a couple of fires and it all makes sense, the gaps and airbricks also help feed the fires with oxygen, you can put a news paper on the floor and i gets dragged across the room to the fire !!!

I have a 110 yr old house constructed of part brick part stone with a similar cavity and I have been advised that cavity wall insulation is not a good idea due to reasons stated.

Ram the attic space with quality insulation if you can, ensuring you leave plenty of a gap into the eaves to allow breathing.

If your issues are terminal use insulating plasterboard on internal walls but be prepared to lose valuable internal inches and have a big job on your hands.

Thanks folks. Sounds like the old git knows what he is talking about afterall 🙂

dad 1 - polish builder 0

Well we had it done on our 1930's semi with no problems. They did however stick a gerat big vent on one wall as we have an open fire in the lounge.

[i]Well we had in don on ouer 1930's semi wiht no problems[/i]

By the 30s hadn't build methods changed - the sort of houses that shouldn't be filled are the first that were built with cavities just after the old style of two skins butting up together was phased out?

I could be balking tollocks though 🙂

There is one corner which always feels cold in the winter (north facing), but I think I'm going to spend the cash on reinstating the chimney and putting a stove in there instead. Should make for a nice warm comfortable office.

I would be loathed to do it as in a house of that age you need to know wall ties being clean with no snots, lintols etc.
If you do add more loft insulation make sure that you leave room at the eaves for cross ventilation or you could have roof condensation probs.
may be better spending your dosh of the heating side with high eff, boiler, correct rads & controls.

You could look at thermal render when you need to replace the existing as a way forward?