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Damp Proofing

1940's bungalow, removed parquet flooring laid with bitumen

Anonymous user 28/02/2024 - 3.51 PM

Hi, So we have removed old parquet flooring as part of a refurbishment and noticed the bitumen residue left behind. When moving our toilet waste it was also highlighted that there was no DPM in place. I therefore have two questions: 1. Would the bitumen have served as a DPM? 2. As we plan to put down laminate flooring and tiles in some areas, what would you recommend? For example should we seal the bitumen, then add a liquid DPM, level then lay the floor? What would be the best course of action and products in this scenario Any guidance would be much appreciated. If you're in and around the Peterborough we'd be happy to also accept a quote for the works. There is a job posted on my account that relates. Thank you in advance!

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4 Answers

Golden construction

Rating: 5 out of 5
Northwich
Yes the bitumen would of provided a D P M The best thing to do is put down latex self leveller then a suitable Underlay this should do the trick Make sure you provide a good floor to wall joint .
Answered8 August 2020
4

Cosmin Construction & Consulting LTD

No reviews yet

Haywards Heath
1. Yes, the bitumen was used as DPM. 2. I would say that for peace of mind and cheap insurance to add a moisture barrier before laying the laminate flooring under the underlay. You could go full-on liquid DPM, but a simpler polyethylene membrane (like the ones you put under houses and extensions) takes far less time and provides the same level of protection. Make sure you use double sided tape and pvc tape (they are both easily available and cheap) at the seams to create a watertight joint. No DPM is common in the states and that is how they avoid laminate moisture problems. If the floor is uneven, a layer of self-levelling is also necessary to avoid further problems down the line. Lastly, be careful with the bitumen removal, back in the day (before 1992) it could contain asbestos...
Answered8 August 2020
2

Anonymous user

I would recommend self levelling silka products are the best it has tanking qualities to resist moisture make sure it’s latex based kind regards Steve
Answered8 August 2020
0

Drypro Dampproofing & Structural Solutions Ltd

No reviews yet

Chesterfield
The bitumen was used to fix the parque floor and was not intended to be a DPC I would recommend removing the pitch as there could possibly be voids in the subfloor and construct a new floor including a DPM in the new floor.
Answered1 September 2020
0