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PostPosted: Tue Sep 05, 2017 9:04 pm 
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Hi all,

Looking for some advice....

My extension plan has 3 sets of bifold doors, 1 patio door & 1 back door. I want my outside ground level (paving) around the full extension to be the same height as with my internal floor level.

Given that I should have ground level 150mm below DPC, can I just raise the DPC 150mm up and then drop this back down at the external door thresholds?

Any potential issues?!?


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PostPosted: Thu Sep 07, 2017 8:14 pm 
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All the experienced builders left the site too?!?


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PostPosted: Thu Sep 07, 2017 8:19 pm 
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getthewheelsinline wrote:
All the experienced builders left the site too?!?


Que ?

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PostPosted: Thu Sep 07, 2017 8:20 pm 
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Helpful.


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PostPosted: Thu Oct 19, 2017 8:31 pm 
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I might have answered this via my phone, but unsure if it came through.


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PostPosted: Sat Oct 21, 2017 10:40 pm 
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Hi CB. Got your message - thanks - sounds as if I should be ok doing what I propose assuming I take adequate precautions for potential water ingress!
Although - struggled to find the paint you suggested?

Cheers.


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PostPosted: Sun Oct 22, 2017 1:03 am 
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adequate precautions is your DPC or DPC's set 150mm above the ground.
the finished floor must be above the Dpc so must any joist tails.
you wont be ok doing what you propose.you are going aginst all good building practice an bblg Regs. Bco will pull you if thyre involved.why do you want to risk givin yourself some kind of damp issues?whats the paint for?


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PostPosted: Sun Oct 22, 2017 12:00 pm 
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My external leaf DPC will be 150mm above ground excluding where the bifolds are.

The floor is concrete oversite, insulation, UFH & then screed. Internal FFL is the same height as inner leaf DPC. Timer frame inner walls on top of this inner DPC.

The full external perimeter will have land drainage and I plan to have 200mm wide strip of stones between wall & paving to help drain any water quickly.

I may also add slot drains at the bifold sill to paving juncture.

I wish to have low threshold at all the external doors & don’t want to be having paving going down at the walls then back up at the doors...

I understand this is not best practice but 150mm step out of bifolds looks gash so I am taking all reasonable precautions against water ingress.


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