It is currently 29 Mar 2024, 07:44
9fingers wrote:DPC must not bridge the cavity.
Bob
Robert wrote:9fingers wrote:DPC must not bridge the cavity.
Bob
You sure bob?
On our extension I remember the builder using a very wide damp course one side to change levels. he called it a 'tray' damp course. It certainly bridged the cavity. hmm maybe the downward angle from inside to out makes it ok.
9fingers wrote:Robert wrote:9fingers wrote:DPC must not bridge the cavity.
Bob
You sure bob?
On our extension I remember the builder using a very wide damp course one side to change levels. he called it a 'tray' damp course. It certainly bridged the cavity. hmm maybe the downward angle from inside to out makes it ok.
Certain not as drawn above. My feeling is that IF something has to bridge the cavity, such as a lintel or window/door opening or other reason, there needs to be a cavity tray stepped down toward the outer leaf to guide any water away from the inside of the building and weep holes provided in some cases.
Best damp roofing has got to be where there is no route for moisture to pass from outside to inside.
Bob
paulrees1 wrote:Hi Roger, i do them in ms paint, email that to myself, then post from my phone. Sounds bonkers but i find it less of a faff than posting photos to a web page or editing on a phone
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9fingers wrote:Bit of a problem with the right hand diagram. The external dpc must be 150mm or more above ground level which means you should not have a ground level door. This would give no threshold for rainwater/flooding etc
Bob
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