Thu, 27 Aug 2026 00:02:51 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309634#Comment_309634 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309634#Comment_309634 Tue, 18 Nov 2025 18:21:57 +0000 rsk1 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309635#Comment_309635 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309635#Comment_309635 Wed, 19 Nov 2025 08:13:29 +0000 GreenPaddy
- is the chimney passsing through the slates/tiles, or is it part of the gable wall, so no break from ground to pots?
- is it a brick or stone build?
- if brick, what is the percieved benefit of nhl over cement-based for masonry that is not part of the thermal envelope, where internal/external vapour movement might be important?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309643#Comment_309643 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309643#Comment_309643 Wed, 19 Nov 2025 22:24:19 +0000 rsk1 Percieved benefits of nhl versus cement based mortars: softer and more porous mortar means better durability of pointing and less likelihood of damage to brickwork because of better moisture management]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309651#Comment_309651 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309651#Comment_309651 Thu, 20 Nov 2025 09:10:53 +0000 fostertom https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309653#Comment_309653 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309653#Comment_309653 Thu, 20 Nov 2025 10:11:49 +0000 LF
I am a novice but we did my son's chimney earlier this year with Lime(Summer)
We read that if mortar should be softer than the brick, I seem to remember.

He used stainless helibars and resin on some parts to make it stronger.
He had 3 bricks come down with the TV arial.
I think we were not that happy with the inside that had all the smoke going through it.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309680#Comment_309680 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309680#Comment_309680 Sat, 22 Nov 2025 18:53:33 +0000 tony https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309682#Comment_309682 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309682#Comment_309682 Sun, 23 Nov 2025 12:34:37 +0000 djh Posted By: tonyI much prefer lime putty to nhlDo you prefer it at this time of year?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309685#Comment_309685 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309685#Comment_309685 Sun, 23 Nov 2025 21:27:11 +0000 Artiglio It was also suggested i add double boiled linseed oil to the mix to improve water shedding and use a masonry water repellant. All this based on many of the bricks being pretty worn. The top 8 courses were taken down and rebuilt using new replacements for the worst bricks.
As with any such job, i’d expect to be long gone before anyone will know if it was the right approach.
I’d hazard a guess that TV aerials having been affixed to the stack had done more damage than the weather. Plus seeing as there probably had’nt been open fires in the place since the seventies another major source of damage is no longer a factor either.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309694#Comment_309694 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18372&Focus=309694#Comment_309694 Mon, 24 Nov 2025 16:45:22 +0000 Peter_in_Hungary Baumit Sanova MonoTrass
which according to the spec. is a dehumidifying plaster based on lime and natural pozzolan, single-layer, water-repellent, for manual and mechanical application, suitable for the renovation of old buildings, for internal and external use.?
It set OK in about 2-3 days and I am impressed with the results - hopefully long term is equally impressive.]]>