Green Building Forum - EWI & Cavity Fill plus new windows for '70s building Sun, 24 May 2026 10:22:22 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 EWI & Cavity Fill plus new windows for '70s building https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163791#Comment_163791 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163791#Comment_163791 Sun, 23 Dec 2012 16:43:31 +0000 SteamyTea Posted By: Nick ParsonsAre popes more or less likely to feel the cold tan members of the general population?

Posted By: Nick Parsonscold tan


That would be windburn then, so yes, or no, if you rather :bigsmile:]]> EWI & Cavity Fill plus new windows for '70s building https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163798#Comment_163798 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163798#Comment_163798 Sun, 23 Dec 2012 18:00:02 +0000 Nick Parsons EWI & Cavity Fill plus new windows for '70s building https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163799#Comment_163799 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163799#Comment_163799 Sun, 23 Dec 2012 18:07:31 +0000 SteamyTea http://www.youtube.com/watch?v=hcCuBWXd-hc&gl=GB&hl=en-GB]]> EWI & Cavity Fill plus new windows for '70s building https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163820#Comment_163820 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163820#Comment_163820 Mon, 24 Dec 2012 10:05:38 +0000 nikhoward EWI & Cavity Fill plus new windows for '70s building https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163824#Comment_163824 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163824#Comment_163824 Mon, 24 Dec 2012 11:46:19 +0000 Nick Parsons
Tish! That means anyone looking anew at the thread will jut think I am mad. Ah......]]> EWI & Cavity Fill plus new windows for '70s building https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163839#Comment_163839 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163839#Comment_163839 Mon, 24 Dec 2012 16:35:36 +0000 samuelvincentvella
My sketch was to show proposed insulation as part of a loft conversion. 25mm gap between felt/roof tiles, and top side of insulation between roof rafters. This would join (somehow?!) to the EWI, which would wrap over the top of the cavity wall, thus providing a continuous blanket all the way around the house with no cold spots.

Questions I haven't yet managed to find the answers to:

1. Do I 'dot and dab' the insulation boards to the external brick wall?
2. If not, what fixings do I use?
3. Do I have to leave an air gap between insulation and brick? I assume NOT, as this will only increase the potential of interstitial condensation.
4. Is a french drain/floor gutter a good idea to carry any rain away from the house, and prevent it going underneath the insulation into the brick wall?
5. Please can you give examples of the wire mesh used to fix to the insulation, which will give the external render something to grab on to?
6. Should I be using a breathable or non-breathable external render? I assume NON breathable. Examples please if you can.

Most importantly, where should I pay most attention to preventing condensation build up? I gather this is the least risky method of insulating ones house and not causing condensation.

I'm going to try this myself, so please relay any horror stories, and things to avoid, and things to remember!!]]> EWI & Cavity Fill plus new windows for '70s building https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163840#Comment_163840 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163840#Comment_163840 Mon, 24 Dec 2012 17:05:13 +0000 samuelvincentvella EWI & Cavity Fill plus new windows for '70s building https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163841#Comment_163841 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163841#Comment_163841 Mon, 24 Dec 2012 17:41:04 +0000 Nick Parsons
Clan Insulations do a system using BASF Neopor 'Platinum' EPS (Lamba 0.030 IIRC):

http://www.thinjoint.com/tech-frame.html (Click on ‘finishing system’).

The person to contact is Chris Hirst (Chris@clan.co.uk).

And for photographs of a house done with this system, see:

http://www.flickr.com/photos/37083475@N08/?saved=1

Wood-fibre products are available from http://www.natural-building.co.uk/

*Other suppliers exist, but I know some on here have had experience of Clan.

1. Do I 'dot and dab' the insulation boards to the external brick wall?

No, I would say. Full coverage adhesive and a few mech fixings

2. If not, what fixings do I use?

Lots of choice. Ask your system provider.

3. Do I have to leave an air gap between insulation and brick? I assume NOT, as this will only increase the potential of interstitial condensation.

No!! It's not interstitial condensation, it's getting outside air between insulation and fabric. Best way of ensuring the inulation does almost nothing!

4. Is a french drain/floor gutter a good idea to carry any rain away from the house, and prevent it going underneath the insulation into the brick wall?

Probably. Big thread on this forum re EWI/French drains.

5. Please can you give examples of the wire mesh used to fix to the insulation, which will give the external render something to grab on to?

Usually it's not wire, but a glass-fibre mesh which beds in the first render coat. Unless you usse wood-fibre and lime render, most of the renders are like 'fat paint'.

Hope that helps.]]> EWI & Cavity Fill plus new windows for '70s building https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163865#Comment_163865 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9366&Focus=163865#Comment_163865 Tue, 25 Dec 2012 08:34:12 +0000 samuelvincentvella