ᐅ Timing of Interior Plaster / Screed / Exterior Plaster – Moisture Considerations
Created on: 29 May 2018 14:15
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cybergnomC
cybergnom29 May 2018 14:15Hello everyone,
I am currently planning the next steps in the construction process of our single-family house.
Now I am facing a timing issue:
Our plasterer (doing interior plaster, exterior render, and screed) says that after applying the interior plaster and screed, the building should dry out for 2-3 months before the exterior render is applied. It is possible to do both more or less at the same time, but he strongly advises against that.
Our installer says this is not necessary and that interior and exterior plastering is usually done more or less simultaneously.
The problem:
The installer will only start with his rough installation (which takes about 3-4 weeks) once the windows are installed (which should be in about 4 weeks). Then the bricklayer could finish the facing masonry by early August. However, the plasterer will have a 3-week company holiday and would only be able to start the interior plaster at the end of August. With 2 months drying time, we would be ready for the exterior render in November, which the plasterer considers critical due to weather. If the schedule goes like that, we probably won’t finish this year.
Now the question is whether such a long drying period between interior plaster/screed and exterior render is really necessary.
Additional info: solid construction (36cm (14 inches) exterior walls). During the structural work (completed about 2 weeks ago including the roof) it only rained very briefly once. The building is slightly elevated and there is always some wind, so the construction is quite dry.
What are your experiences with this?
I am currently planning the next steps in the construction process of our single-family house.
Now I am facing a timing issue:
Our plasterer (doing interior plaster, exterior render, and screed) says that after applying the interior plaster and screed, the building should dry out for 2-3 months before the exterior render is applied. It is possible to do both more or less at the same time, but he strongly advises against that.
Our installer says this is not necessary and that interior and exterior plastering is usually done more or less simultaneously.
The problem:
The installer will only start with his rough installation (which takes about 3-4 weeks) once the windows are installed (which should be in about 4 weeks). Then the bricklayer could finish the facing masonry by early August. However, the plasterer will have a 3-week company holiday and would only be able to start the interior plaster at the end of August. With 2 months drying time, we would be ready for the exterior render in November, which the plasterer considers critical due to weather. If the schedule goes like that, we probably won’t finish this year.
Now the question is whether such a long drying period between interior plaster/screed and exterior render is really necessary.
Additional info: solid construction (36cm (14 inches) exterior walls). During the structural work (completed about 2 weeks ago including the roof) it only rained very briefly once. The building is slightly elevated and there is always some wind, so the construction is quite dry.
What are your experiences with this?
We also had the plastering done fairly close together. The question of whether to let it dry first was considered, but the plasterer didn’t see any problem with proceeding.
A positive aspect was that the scaffolding simply remained in place longer, which made the holding costs cheaper than taking it down and reinstalling it weeks later. Our exterior plastering actually took about 3 weeks due to the necessary drying times before applying the next layer. This should be taken into account if any house utility connections need to be accessed underneath the scaffolding (especially for screed heating), since our utility providers did not do any digging until the scaffolding was removed.
A positive aspect was that the scaffolding simply remained in place longer, which made the holding costs cheaper than taking it down and reinstalling it weeks later. Our exterior plastering actually took about 3 weeks due to the necessary drying times before applying the next layer. This should be taken into account if any house utility connections need to be accessed underneath the scaffolding (especially for screed heating), since our utility providers did not do any digging until the scaffolding was removed.
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