Mon, 25 May 2026 12:09:36 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1656&Focus=19694#Comment_19694 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1656&Focus=19694#Comment_19694 Wed, 30 Apr 2008 15:19:21 +0100 krishna
2. How do I tell where the damp proof course is? Suspended timber floors. Air bricks are level with the joists. I wanted to move them down one or two courses to make it easier to make floor airtight and insulate.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1656&Focus=19695#Comment_19695 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1656&Focus=19695#Comment_19695 Wed, 30 Apr 2008 15:36:23 +0100 tony
2 It is OK to move the air bricks down. The dpc will be where the bricks stop looking a bit green, damp or discoloured. What are the walls made of?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1656&Focus=19697#Comment_19697 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1656&Focus=19697#Comment_19697 Wed, 30 Apr 2008 15:43:55 +0100 Paul in Montreal Posted By: tonytry taking a lump off and see if there is any horse hair in it, if there is then it is lime, if there are lots of cracks in it it is not!

This is not a reliable indicator (presence or absence of cracks). I have most certainly got lime-based plaster in my house and it most certainly has both horsehair and cracks in it - the cracks being due to various causes. Lime-based plasters do not have an unlimited life - especially if on wooden lath.

Paul in Montreal.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1656&Focus=19705#Comment_19705 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1656&Focus=19705#Comment_19705 Wed, 30 Apr 2008 16:29:56 +0100 Mike George
Also most cement renders are grey in colour. Lime renders vary depending on the aggregate mixed with them. Often White, black or brown.

Finally porosity. Cement renders tend to be less porus and will not usually absorb water as readilly as lime.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1656&Focus=19747#Comment_19747 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1656&Focus=19747#Comment_19747 Thu, 01 May 2008 00:59:43 +0100 krishna Posted By: tony1 try taking a lump off and see if there is any horse hair in it, if there is then it is lime, if there are lots of cracks in it it is not!

2 It is OK to move the air bricks down. The dpc will be where the bricks stop looking a bit green, damp or discoloured. What are the walls made of?

I'll check the plaster tomorrow. I think there may be a mix. If the existing plaster or external render is cement based, I assume there is no point in using lime plaster?

Re dpc, the walls are solid brick. None of the bricks look green, damp or discoloured, at least none of those above ground.]]>