swank

thanks, is there an easy way to find out how much above insulation exists ? We are planning to open the plaster board from inside so don’t think we will be able to determine it. also a dumb question if mineral wool is pushed below deck and then there is air gap and then vapour barrier, so how would the mineral wool be supported by ?

Yes that is right, we dont know what is above, and wanted to see if we can improve insulation without causing any harm. Seems like keeping half space above should be enough, and we need to figure out where to put vapour barrier.

Thanks so we were thinking mineral wool insulation. So we leave two third space above and only fill one third of it, where does the vapour barrier go, below or above mineral wool? We do have spotlights

We are doing a renovation of our ground floor bungalow which has an extension at the rear. The previous owner had extended it around six year ago. Our building took out a spotlight in the flat extension roof to find there was no insulation, he mentioned that although this seems like a warm roof, there can still be insulation under it and he is recommending to do it to improve overall insulation. Since it is part of a larger renovation, there is no significant incremental cost to it, so I have the following question: 1. Based on my limited research, there is not supposed to be insulation within joists, so is there any benefit in doing it? 2. it seems there could be condensation issues if this is not done right, then is there a way to do it which gives benefits without causing condensation issues Overall I will be open to doing something because the cost is negligible and if there is a chance to improve insulation I want to do it, however if it doesnt give any benefit or worse can cause condensation then I would skip.

Sure thank you .

Thank you this is helpful. Do you have any recommendations on what is the best way to do it in an old house with suspended timber flooring. Raising the floor height will be quite challenging for us, is there a way to do with the existing floor height in a less disruptive/expensive way?

Context - we recently purchased a 4 bedroom Bungalow with a top and rear extension. It is a 1940-1950 build with suspended timber flooring and solid walls. The rear extension kitchen was done in the last five years and is concrete flooring. The upstairs is also done in the last five year , so has cavity stud walls and better insulation. All windows are double glazed. We are looking to renovate our ground floor and one thing we want to do is get underfloor heating. Our builder recommended that we can either go for spreader plate system or a pregrooved insulation board of 25mm I was hoping to get everyone's guidance with the following: 1. Will the levels of floor insulations you would expect from a 1950 house, is it a good idea to go with underfloor heating with the above mentioned systems? Because if we have to redo the entire flooring to upgrade insulation, it would become quite expensive 2. I talked to one of the build regs inspector. They mentioned that the highest specification of regs are very high specification, but realistically they dont expect it can be always done during renovating, so they are flexible on what can be done. So I am hoping building regs wont be an issue, any thoughts 3. Is any one of the above systems better than other ? Are they situations when one is better than the other 4. Any thing we can do with flooring insulation which could be a quick win without massively increasing the height or cause redoing the sub floor Thank you for your guidance.