Hello everyone,
I'm hoping to get some input about the proposed buildup of internal insulation for the first floor of our house which is Victorian timber framed.
Firstly, for a bit of background, the exterior of the property was re-cladded a couple of years ago. The original cladding was in quite poor condition and since we needed to completely replace the large sash window box we decided that the best course of action was to go for new timber cladding (the new window box was built to account for the extra depth). The original cladding was wrapped in a breather membrane, followed by battens and then the new cladding was fixed on top of the battens (photo attached below showing the new cladding and the much agonised over new chimney).
Now that we're confident that the house is watertight (which it very much was not before we re-cladded) we now want to plaster the internal walls. We unfortunately had to remove all the internal plaster - it was in such a sorry state having had bodged repairs over the decades with plasterboard, cement and even an asbestos panel spliced in with the lath and plaster.
Our plan is to fit dense 75mm mineral wool batts between the original studs. This will leave about a one inch gap between the outside face of the mineral wool and the inside of the original cladding. We will then fix 15mm wood wool boards to the studs. This will provide a solid base level of thermal and acoustic insulation (at the moment it has all the thermal and acoustic properties of an old barn). We then want to build a second internal 3x2 or 4x2 stud wall leaving about a one inch gap between the new wall and the wood wool boards. This stud wall will be filled with more mineral wool batts and boarded over with 15mm wood wool boards. It will finally be plastered with a haired lime putty plaster from either Chalk Down Lime or Anglia Lime. I've used both of their products and even I was able to get a serviceable finish - although I don't think I'll attempt the ceilings.
What do we think about this as an insulation build up? Is there anything that needs to be considered to avoid potential problems in the future? Our thinking is that since we're at this point of looking at the original timber frame from the inside that we should install as much thermal and acoustic insulation as is practical. The room is large enough that losing a few inches along a couple of walls won't be noticeable but the hope is that the much improved u values will be.
Many thanks as always.
I'm hoping to get some input about the proposed buildup of internal insulation for the first floor of our house which is Victorian timber framed.
Firstly, for a bit of background, the exterior of the property was re-cladded a couple of years ago. The original cladding was in quite poor condition and since we needed to completely replace the large sash window box we decided that the best course of action was to go for new timber cladding (the new window box was built to account for the extra depth). The original cladding was wrapped in a breather membrane, followed by battens and then the new cladding was fixed on top of the battens (photo attached below showing the new cladding and the much agonised over new chimney).
Now that we're confident that the house is watertight (which it very much was not before we re-cladded) we now want to plaster the internal walls. We unfortunately had to remove all the internal plaster - it was in such a sorry state having had bodged repairs over the decades with plasterboard, cement and even an asbestos panel spliced in with the lath and plaster.
Our plan is to fit dense 75mm mineral wool batts between the original studs. This will leave about a one inch gap between the outside face of the mineral wool and the inside of the original cladding. We will then fix 15mm wood wool boards to the studs. This will provide a solid base level of thermal and acoustic insulation (at the moment it has all the thermal and acoustic properties of an old barn). We then want to build a second internal 3x2 or 4x2 stud wall leaving about a one inch gap between the new wall and the wood wool boards. This stud wall will be filled with more mineral wool batts and boarded over with 15mm wood wool boards. It will finally be plastered with a haired lime putty plaster from either Chalk Down Lime or Anglia Lime. I've used both of their products and even I was able to get a serviceable finish - although I don't think I'll attempt the ceilings.
What do we think about this as an insulation build up? Is there anything that needs to be considered to avoid potential problems in the future? Our thinking is that since we're at this point of looking at the original timber frame from the inside that we should install as much thermal and acoustic insulation as is practical. The room is large enough that losing a few inches along a couple of walls won't be noticeable but the hope is that the much improved u values will be.
Many thanks as always.