dpc for new patio door

[kbrownie]

Hi I have just removed a window and replaced it with a patio door, the internal reveals now need tidying up. The cavitity at floor level is now open, due to the fact I needed to cut down from window to floor to fit in door, does this need to have a DPC before I fill in and plaster up? and if so what would be best method?
Regards
KB

[welsh brickie]

when you fit pvc door you will be left with a outer and inner wall.
fit the door flush with the back of the outer skin of brickwork.
the cavity will be open obviously or you may or may not have insuation.
Make sure all debris is clear of the cavity at the bottom of the door.
I would suggest if there is no insulation use drytherm,its water resistant
fill only the sides of the walls do not fill the bottom it must be kept clear.
Once done to finish the job use window board (mdf) or similar to finish
the bottom of the door,and dryline the reveals to the door.
Then plaster to finish.
Alternativly for a better finish use plastic to line the entire reveal.
Measure the reveal allow 5mm extra and use fascia cover board. silicone
spots on reveal and stick make sure its staight silicone will grip it and set after a couple of hours.

[kbrownie]

Hi welsh brickie,
Thank's for reply, my mate fitted the window it's his job but not fensa reg'd. But I did put building notice in, so want job to be right, both for me and local building controls. My window fitter put cill board over internal threshold when installing window. I offered to finish internal reveals off to save him some time as he did as a favour. So if I now fill in the cavity from cill board upwards with drytherm, would that be okay?
I can dryline and plaster, so that's no problem.
Thank's again info much appreciated.
KB

[TheDoctor5]

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[thedoctor]

See the project on cavities, lintels and insulation and then look at the various projects on damp and cold spots together with condensation. You will see that insulating part of a cavity causes cold spots in the other parts which in turn causes air in the building to condense and mould is then given a chance.

Sometimes it takes a little while to find all the answers in the projects section because in the building industry it is mainly the case that there are several answers to one question. We try to offer a full understanding about the construction process on this site so our users can become aware of how their houses work. We do this because we believe prevention is certainly cheaper than cure when it comes to rectifying building mistakes.

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