Ready to hire?

Post your job in minutes, browse real reviews and choose who to speak to.Post a job

Need some tips or advice?

Damp Proofing

What kind of floor should I put in after applying liquid DMP in my outhouse utility room?

Anonymous user 23/02/2024 - 3.53 PM

Hello there, My utility room is a tiny extension to my house (about 2m - 1.2m, and the floor of it is below the DMP of the house (about 15 cm below) - the room gets damp and mouldy. I want to apply liquid DMP to the wall beneath the DMP, and also to its floor. After that, I want to make a floor that is the same level as the rest of the house, so you don't have to step down into it. What would be the best way to do this? BTW, I also want to insulate the floor. Thanks in advance for your advice! Thank you Bluedoorproperties. Can I ask, if I did a chipboard deck, how would that be fixed to the wall? Would it require some form of joist? TIA :-) Thank you WPD Productions Ltd. There are already two full-size air bricks in my utility room, I am guessing that the reason it still gets mouldy is because of the area of bricks under the damp proof course that are exposed in there. Also, I suspect that a portion of decking that is level with the damp proof course outside the door is bridging the DPC and may be introducing additional water into the utility room.

Are you a tradesperson and able to answer this question?

3 Answers

Bluedoorproperties

Rating: 5 out of 5

Doncaster

Hi I would fit a solid damp 1200 gauge 50mm of insulation and 100 mm of concrete Or 1200 membrane on 125 insulation and chipboard deck

Answered19 August 2023

Anonymous user

Ventilation will be most important if it's going to me a utility room 1st of all. Secondly I would do 3 coats of liquid damp and thin as possible soft sand to make flat then 70mm to 100mm depending on how level the floor is in foam board insulation and then minuim 50mm fibre reinforced screed to give you a nice warm solid level floor. If you need this done please call me Tony on 07591 637726 from k n b construction

Answered29 August 2023

WPD Productions Ltd

Rating: 5 out of 5

Tottenham, London

I hope I understand your description correctly: Your current floor level in the utility room is 15cm below the existing finished level of the rest of the house. On that basis I would make three openings in to the walls of the utility room on current ground level, fit 3x half size air bricks. Then install a timber frame on to the concrete floor - use 2x4's, use the 4inch as the height. Cut notches into the undersides of timber frame to allow the air to circulate. Lay 20mm structural ply board on top of the timber frame. Then 6mm wood fibre board onto the flyboard, then 20mm engineered wood flooring. You should be level with the rest of the house and the underfloor is ventilated and your floor is insulated. This building recommendation prevents the build up of condensation.

Answered30 August 2023