Moggaman

Hi. I will have 2 walk in showers in my new build. Both will have concrete walls on 3 sides of the shower.. they will be tiled but am wondering if I should plaster the walls first before the tiler or does the tiler generally tile onto block. thanks

Now that I have completed the taping around windows I am looking at potential plastering issues!.. in some places the window straps sit out a little from the block/insulation so the tape whilst good , as it goes around the straps creates an air cavity in behind the tape.. will this create a plastering issue?

I am learning as I go… the walls are wet plastered but the reveals cannot be wet plastered I presume as it won’t bond to tape across the insulation… presume I will have to plaster board the reveal and then skim!??..but what about the part of the reveal block behind the plasterboard that does not have tape on it ?.. is that an air issue?

Hi. Just wondering about Siga Airtightness tape. I have a new block house with 110mm PIR board. I am using Siga Fentrim to airtight from the window frame across the insulation to the block. I have a roll of Siga Corvum also and I am using this to bridge across onto the cill. I am using Siga corvum cause it’s narrower and I don’t need to bridge across only 50mm of insulation. Is that ok?. what is Siga corvum used for generally? Also, do I need to fully cover the metal straps with tape ?

Thanks for all the input here . I am going to plaster walls first from ceiling down to subfloor level .Quick question on expansion of the plaster?..I will have expansion insulation between floor and wall plaster. Will the wall plaster need room expand?.

Sorry to labour the point but I’m not with you!. I will have sand cement render onto block as my internal finish. That’s probably 12mm to 15mm. The insulation is 25mm!.. won’t it be seen? my best option is a stop bead , maybe 10mm above ffl. Plaster down to this . Do floors with polyiso strip largely sitting under wall plaster and cover with skirting board… I can’t see another option.

Thanks Dave, they look good. Won’t about 5mm of the polyiso strip be visible tho!

How do people achieve that clean wall floor look then… ie no skirting.

My finish is just wet plaster!

So with my detail, I will have a 25mm insulation strip viable after the floor pour.. too wide to be covered by skirting……aaaaaahhhhh all these little details biting me in the ass ……

Because the walls are done after the floors in many cases , the plastering covers the expansion strip (insulation€ )… is that what you mean?

Hi. We are putting in a polished concrete floor in our new self build. My wife would like no skirting board at the wall floor junction. The walls will be plastered before the floor. there is a 25mm strip of insulation to go between the floor and the walls. Clearly If that is brought to the top , it will be seen. Slab is 75mm thick… can I stop the insulation at 50mm and run the slab over the top of the insulation?? I see no skirting on programmes a lot these days and wonder how they achieve it thanks

Hi I have 2 questions please. I have hollowcore , then 150 suspended ceiling . The electrics and mvhr people broke out holes to get services thru in this area . Do I need to mortar up around these on internal walls? . Is it good practice . 2. The electrician also brought out some cables thru the external block.. what tape is best to airtight these? thanks

The rafters are 175mm deep and my insulation is 125mm deep so the 50mm gap is definitely there. I have spend a lot of time putting in insulation and it is more than friction fit… it’s hard to remove !.

This is outside

Some more pics..

Soffit is wide open currently!.yes 50mm air gap behind insulation into cold attic with vents on attic roof.. there was frost yesterday as well

Thats what people are telling me!!

It is open at eaves … eaves not finished yet and open into attic space which is uninsulated

Hi. I am in the middle of insulating the rafters on my self build. The windows and doors are in . I have most of the rafters done with a 50mm air gap behind. I have not the ceiling slabbed or insulated yet. it was brought to my attention that the membrane behind the PIR board is sweating a lot.. fine where there is no insulation but sweating alot where there is. I have no hearing yet. I used corotop blue breather felt… pls someone put my mind at ease… thanks

Thanks

Thanks