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| Ed K: (30/12/05) | RE: Internal walls - solid granite - lime plastering ? |
| Well this has certainly blossomed since I last looked .. been busy with Christmas and so on.
Anyway from looking at alot of granite houses over here over the last couple of weeks I can see the solutions that most people use. Most if not all of these houses do not have DPCourses. So quite a few houses plug in dehumidifiers for the whole of the winter and most of the spring, oh and the autumn too... ! Quite a few other houses use insulated plasterboard, some with no membrane and others with a built in membrane. It seems to be quite expensive stuff but I think I will go with that option as it seems to prevent the internal condensation and subsequent black mould that is rife in all granite houses over here in winter that don't have any internal insulation. Apparently you skim the wall then cement the insulated plasterboard to the wall. THis will stop condensation and make for a warmer house but I am concerned about what is going on in the wall still. Will it continue to have rising damp ? Or can this be alleiviated by doing things like French Drains (still haven't broken my back on that one David but maybe in March). Any advice would be most welcome - have a good New Year one and all. Ed | |
| Nick M: (03/01/06) | RE: Internal walls - solid granite - lime plastering ? |
| Not wanting to open a new topic forgive me for entering this one with a question. Like Ed I have a 200 year old granite cottage but in South Devon. I am experiencing paint flaking and blistering on most of the ground floor internal walls in patches up to 3 feet from floor level(mainly the room dividing walls with no external face). The whole of the cottage seems to have had an ashpalt floor applied with a 2-3 inch "skirting" up the walls, so I guess moisture is trying to find the only way out! The internal walls are 6 inch rubble filled with a variety of plaster renders, some old and some newish. I have used what I thought where breathable paints, latterly a F&B casein distemper but it still ony lasts for a few weeks. "Professional" advice seems to be either silicon injection of a damp course or another suggested re-plastering with Lime plaster and painting with limewash. Someone else suggested covering the offending area with T&G boarding a la Pub! It seems very hard to get independent professional advice, can any one help?
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| david hyde: (06/01/06) | RE: Internal walls - solid granite - lime plastering ? |
| Nicky
The way to get independent professional advice is to employ an independent professional. These people do exist, but I am in Scotland. You could try David Moore in Newton Abbot (Property repair Centre) but he does make his living selling stuff, but his advice would be work seeking. | |
| Nick M: (08/01/06) | RE: Internal walls - solid granite - lime plastering ? |
| David,
Thanks, will contact him next week. Do you think I should avoid any suggestions of a silicon injected damp course? Nick | |
| david hyde: (08/01/06) | RE: Internal walls - solid granite - lime plastering ? |
| Aren't you prejudging the professional advice you are seeking?
Your description sounds like rising damp. Most of it would go away if you stripped the walls back to bare stone, is this OK? If not other options will need to be considered. Even if you did strip back to bare stone you would still get readings on a moisture meter at any time in the future and you wouldn't be able to sell your house. Pragmatism wins every time in my book. I prefer the active electro osmotic sytem in stone walls. Good luck. | |
| Nick M: (09/01/06) | RE: Internal walls - solid granite - lime plastering ? |
| David I think I see what you are saying but I am not prejudicing any advice I am given whilst I am taking reasonable steps to ensure that the advice I was given is sound!
I spoke to Mr Moore today and he very sensibly suggested that I should check the mains water and drainage for leaks before doing anything else. So I will do that first. As for stripping the plaster off the walls, I would rather not. My feeling is that these internal walls have been bashed about over time and they wouldn't present a particularly pleasing sight. The insides of the eternally facing walls are OK but then there doesn't appear to be a problem there. Thanks again for your comments and if you can come accross an independent proffesional in my area I would be grateful for his details. Nick | |
| david hyde: (09/01/06) | RE: Internal walls - solid granite - lime plastering ? |
| If rising damp was identified what would you plan to do about it? You dont seem to want a damp proof course and you dont want to dry line the walls. You will not be able to cure the contaminated plaster.
I will be in Devon some time in the next six months. | |
| Nick M: (13/01/06) | RE: Internal walls - solid granite - lime plastering ? |
| Hi David,
I am not saying I don't want a damp course, I just want to be absolutly sure that this is what is needed before going ahead. It seems that there are two schools of thought those that recommend modern methods for old houses and those that say that old houses were built to deal with damp by using breathable materials. There are also a lot of people, on the various internet forums, that suggest that a silicon damp course is not the cure in old buildings, but I don't know their qualifications! Basically I am confused!!! Mr Moore seemed to steer me down the latter course, but to be fair he hasn't seen the problem I have only described it to him in my laymans terms. I would like an independent expert to give me a steer on this one. Thanks again. Nick | |
| david hyde: (13/01/06) | RE: Internal walls - solid granite - lime plastering ? |
| The proof you seek can be obtained by sampling the walls and carrying out analysis for total and hygrscopic moisture. these results wll give you the "free moisture" content. This should actually be zero but I wouldn't normally recommend treatment unless above 2%. Silicones properly injected will cure rising damp but injecting into stone walls to get close to 100% coverage can be problematic. I did say I preferred Lectros electrosmotic in stone walls.
Dry lining alone could produce a dry surface without a DPC but if you are going to do that much work the addition of curing the rising damp while the wall is open seems to me logical. Trust me the plaster is done and will have to be replaced. You can replaster onto a drylining membrane. | |
| alice carey: (14/05/06) | RE: Internal walls - solid granite - lime plastering ? |
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it is a liittle late to be replying to this but i thought it might benefit someone.i have restored two houses now,one is an 18 century anglesey granite house and one a 16 century norfolk red brick house . both had damp problems.the welsh house had been empty two years and the down stairs walls had been unwisely encased in plasterboard,this was completely rotten.the norfolk house had been occupied but not adequately heated.in both cases the problem has been solved by an adequate heating system and the removal of as much inappropriate materials as was possible.i took advice from conservation bodies and did considerable research of my own using google and those old fashioned things called books.konrad fischer is correct in what he says.rising damp is rarely the problem and many believe it does not exist.modern damp proof systems do not work in old buildings in fact they are likely to damage the building fabric. french drains do work although a few buildings may have a problem with a high water table.the problems with damp buildings,in my experience,are concrete render and flooring and lack of heating,mostly this is caused by condensation and/or guttering etc. i cannot go into all details but i would mention that it is not necessary to remove lime plaster which is pitted, a new layer over the top will correct this.removal of separated plastered excepted,in fact lime plaster can be re attached by various methods but in most buildings it is probably not appropriate to go so far. there is a considerable amount of information on google ,in specialist books and advice to be had from conservation bodies so i am surprised there is still so much mis-information out there. if you own an old house only take advice from a builder or body that has appropriate knowledge.there are lists on google. | |
| colin: (14/06/06) | RE: Internal walls - solid granite - lime plastering ? |
| I have read this thread with interest as i have a Barn built in the late 1700,s the barn is all stone and has now damp course and when we originally started work we had wet walls up to about 1 metre, this lasted on and off for the first year and is now disappearing as we work to renovate and change it in to a home the damp is a mix of rising as there is n o foundation or DPC but more so condensation check that your floors have a damp membrane as this was the main cause for us, as the weather warmed up the floor was always cold and damp this caused condensation from ground level to a metre high as we have replaced floors and damp proff membranes have been put in place the problem has all but gone.. Bon Chance! | |
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