Single brick outhouse into wet room advice

ds1980

Hi all,

Been a while but have a new project on my hands. Looking to turn our downstairs outhouse into a wet room / utility room.

It is single brick at front and back and don't really want to lose space by building a cavity wall....just thought i could build a skin outside not sure on practicality of this....anyway.... I was thinking of boarding with the thermal plaster board instead and the thermal aqua dec stuff in the wet areas. I assume i would us ethe same stuff for the ceiling parts?

Has anyone any advice on best practice. It's not that damp but have seen that a battening approach with then a foil backed board infilling with rockwool or alike may work. Costs, space and work i want o keep to an absolute minimum.

As for the wetroom can anyone offer advice on this? I know that the tanking is important but as it's downstairs the work shouldn't be too bad. I am thinking about underfloor heating also. is this recommended? easy? I do have the capabilities to run CH but there would be some box work needed to store pipes which may take up valuable space.

Any thoughts would be appreciated.

thanks,

David_Aldred

Hi ds1980,
Please have a look at my posts on this forum regarding damp and you may wish to consider application of a waterproof membrane system with appropriate vapour barrier and insulated dry lining. It is crucial that the vapour barrier is fully effective with such a system in order to prevent condensation within the system that could make the area very damp.

Please also consider increased background and mechanical ventilation to the wet room area and preventing warm moist air moving from this area to colder surfaces elsewhere in the house and condensing out. The use of a humidity controlled extractor fan is highly recommended set to commence at a point below which mold will flourish and overrun for at least 15 minutes. Depending upon room size I prefer the 150mm diameter 60 litre / second air exchange units to the 100mm diameter 15 litre / second units.

Further information on membrane dry lining is available on the following sites if you look under cavity drain systems:

Safeguard Chemicals - Redkiln Close , Redkiln Way, Horsham, Sussex, RH13 5QL (tel 01403 210204 ) www.safeguardeurope.com

Wykamol Group – Unit 3, Boran Court, Network 65 Business Park, Hapton, Burnley, Lancashire BB11 5TH ( tel 0845 4006666 )
www.wykamol.com

Sovereign Chemicals – Park Road, Barrow-In-Furness, Cumbria. LA14 4QU ( tel 01229 870800 )
www.sovereignchemicals.com

Hope this helps - kindest regards David Aldred Independent damp and timber surveyor

ds1980

David,

Thanks for reply will do that. Am i assuming that by this you mean a membrane behind the desired new interior wall surface? I was thinking about putting something like this in place but leaving a space behind this and the outer brickwork as it can get wet and then cause problems internally. I will read up more.

Fortunately the building is attached but seperate to the house so i shouldn't have too many problems with condensate except in the outhouse itself.

Thanks again

ds1980