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Hi to all plumbers out there. Looking to confirm my understanding of my underfloor heating design as I'm getting conflicting info from my plumber, my electrician, and my underfloor heating tech support :( I have a system boiler with an unvented cylinder "behind" a 2 port valve, a 4 zone...

Hi all, I was struggling to find an appropriate title for this post, so hopefully the description here will clarify: I've just built an single storey rear extension, which turned a 1 meter brick-cavity-block wall from external to internal as per the below diagram I want to keep that...

Hi forumites, I need to attach a 70mm by 200mm 1 meter lengths of timber underneath a large 200mm by 200mm 5 meter steel i-beam in order to make up for the difference between the sliding door height and the structural opening height. My engineer suggested I can drill as many holes as I need...

Hi all, The steel beam in my extension has been installed at a height of 2210mm but my sliding doors that are going in that opening require only a 2140 structural opening. What can I do to make up for the remaining 70mm? E.g. can I attach a timber plate under the steel beam and then install...

Hi all, I currently have a brick - cavity - block external wall construction in the ground floor going up into a single block wall for the first floor. I intent to apply external wall insulation in both floors eventually to eliminate thermal bridges and improve overall performance. I have some...

Hello forumites, I'm renovating my property currently and wanted to insulate what is going to be the media room floor and also bring it up to the same level as the rest of the house. This room used to be the garage, hence the floor height difference, and that's why the floor is sloping a bit as...

Hi all, Got my brand new kiln dried, regularised C24 2" × 7" joists today, and after putting one of them up I noticed the below on it: I doubt there is anything sinister going on there but thought to double check with the forum just in case. The length is around 15cm, and it's dry and hard...

Hi forumites, I have some internal walls knocked through and the engineer specified a steel picture frame for one of the walls in order to distribute the load better. This is where the steel beam is supported by two columns which then in turn sit on a spreader plate. The spreader plate would be...

Hi all, My ground floor is of beam and block construction with a 150mm or so void underneath. I initially thought it had no airbricks whatsoever although I found out they had simply been covered / blocked by garden soil, patio slabs, etc. I've read that the void needs to be ventilated and my...

Hello all, I'm renovating my property completely and want to make it as airtight as possible so I can install a MVHR. The house is two storey detached and has cavity wall in the ground floor but single solid wall on the first floor. My questions are around the first floor joists, which they...

Hi all, I'm renovating my property and all the walls are currently solid walls with an 8mm or so concrete skim (?) which has been painted over. I wanted to expose the concrete in certain walls so my question is: how do I get rid of the paint over the concrete? I've tried scrapping it and while...

So, I was lifting my floorboards on the first floor when I find this alien looking thing under the boards in a corner on the external wall. Anyone knows what this is and what I'm supposed to do with it? Thanks!

Hello forumites, I am renovating my home and have started lifting some of the chipboard floorboards in the first floor. My plan is to insulate with 25mm boards between the joists, and then install underfloor heating on top of the insulation which will require another 25mm. I am also considering...

Hello all, Just started renovating my new property and I have a couple of questions about the floor: - as per the photo attached, it seems like it has a concrete base (it seems like concrete blocks or something, judging by the dividing line in the photo?) and then some sort of screed mix on...

Hi all, I've been using this forum for many years now and found it particularly helpful. I'm now facing an interesting challenge and I'm getting a bit of conflicting advice so thought to tap into the diynot community more directly this time. I currently have a regular boiler with a vented hot...