Groundwork & Foundations

Bridging damp course

Anonymous user 16 March 2024 - 2.50 PM

Hi everyone, I'm a little stuck on something and would really appreciate some advice. So I have a plan to raise my patio outside level with my bi-folds, I have been told this isn't a good idea by several with ways to get offer the rising damp potential issues by others The plan. (total of 300mm to floor level) I will concrete footings and a 100mm base first for the retaining wall and sub-base with A142 mean I it. I then will fill with hardcore, I have 3 air bricks so I will be using channel to vent these thorough, then type one whacked down and then 70-100mm left for laying slabs. The potential rising of damp issue, I will blackjack the sh*t out of the entire 300mm of bricks including the damp course. I will then run 1200g membrane up the wall too, with also an aco drain which will be just above my air bricks being ducted running the full width, then ct1 silicone the back of them where it meets the bi-folds. Im hoping this would prevent any damp issues, its a new extension and I want to get this right. Thank you

proslab

Rating: 5 out of 55593 reviews

Highbridge

Have you thought about block and beam with the height you are going . Then use your air block on outside ot structure. Still use dpm underneath and blackjack interenal wall . Compact stone type 1 . The more air underneath the better .

Answered15 May 2023

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Sjc.one

Rating: 4.9 out of 54.95182 reviews

Prescot

Yes that would be ok with what you plan to do

Answered16 May 2023

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Anonymous user

No need for any of that all you need is a threshold slot drain put in against your threshold connected to the nearest storm drain ie downpipe connection nice job and much cheaper

Answered17 May 2023

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Taurus Construction

Rating: 5 out of 5551 review

Northampton

Personally i think the issue will come when rainfall splashes up on the masonary above the dpc, one way i would suggest is to potentially leave a 150mm border around anywhere that is masonary and fill with gravel but ensure there is an exit for rainwater, but where the bifolds are, pave up to them. just a gravel border around then like you say put the channel vents through the oversite and i think there is a lot lower risk of rising damp

Answered21 May 2023

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