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How’s the damp going to come up if the dpc is slightly lower? not like it’s bridged is it?

Hello. I’m installing a shower tray and was to do it properly (obviously). I have an 18mm shuttering ply floor and am planning on laying a weak mortar base 5:1 or 4:1 cement. My question is how much mortar and how to make sure there is no air bubbles to easily crack the tray. Secondly, how to...

Hello, does your dpc on the outside need to be the same height as the inner. Below shows the inner floor height at outside ground level, then the inner dpc underneath suspended floor. I’ve heard that as long as cavity isn’t filled, damp can’t penetrate through skins. I do this as i don’t want...

yes that what i meant sorry vapour plasterboard, i have downlighters that need a 40mm gap, so that should be ok. I just need to know if my 50mm insulation with 50mm gap, with through ventilation will cause me problems? Thanks

thank you and @Notch7 for you help, i am very thankful.

you would use 6x2 joists here correct? but the thing is if i had to i’d rather do a warm roof and ensure it works compared to the hybrid which we don’t know, unless you have used it and had no problems?

yes I think i might have to. what is the minimum insulation thickness of cold roof and minimum air gap?

:eek: need it about 130mm

:eek: need it about 130mm

inside floor of house is about 15cm higher. need to match up with this, also house has a pitched roof and we want the height of the extension to be at the last slate tile, so we can have the guttering same level, any higher will have a flat roof sticking out and will make the side profile look a...

span of 4x2 from wall plate to wall plate is about 2 metres.

what do you mean by two steels? how far thick will this make the ceiling? if you read what i said to mikey just then, do you think that will be okay? Cheers

Hi i did put a post on the roofers section, and i said i would do a cold roof with 50mm insulation flush with the bottom of the joists, this leaves a 50mm air gap that i will ventilate with fascia vents on 3 sides, on the bottom of the joists i will put a vapour barriers and top it off with a...

Hello, what i am planning on doing is having 4x2 joists with osb and epdm roof. i plan to put moisture resistant plasterboard and will put 50mm of insulation tight to the plasterboard, which will leave about a 50mm gap of air. I now know i need ventilation, to which i will be putting fascia...

well warm roof will bulk it out about a foot, and cold roof you have to leave a gap, can’t remember how much. I can easily add vents on fascia board though.

extension

constructing a warm roof will not be possible due to the height of the roof. small joists prevent a cold roof. so i was wondering if i could have an empty void with no insulation, moisture plasterboard if it helps. I understand that i may need ventilation, and i would do this via fascia board...

thank you, straight to the point, perfect.

correct and once i lay my sand blinding then the dpm, does this just butt up with the brickwork, as someone said to connect it to the dpc? then i lay my 50mm concrete. thanks

hi @oldbutnotdead, could you help me out with a dpm question. i have posted on here but i am still not understanding. i have a timber raised floor, and am getting mixed answers whether or not to put a dpm between the sand blinding and the 50mm of concrete. A person has said that do put a...