Hi,
There are a few threads on the subject. However I am no surveyor or builder, so I want some input on what would be the best approach on extension spacing and damp mitigation, based on experience. And if anything to discuss before that wall goes up.
The neighbours are building a 4 meter extension right next to our existing one, semi-detached houses. We have already consulted with each other and their builder intends to leave a bit more than 100mm gap between walls. Our extension is pitched with tiles, theirs will come at lower height as a flat roof (~3metres tall), potentially meeting our eaves at same height.
While researching on issue of damp, I read from a surveyor the proposed solution for debris and damp prevention, is by way of lead flashing chasing our side wall render and bridge on their roof. So that it seals the highest point between walls to prevent things falling in.
When I put this to the neighbours, their builder responded with alternative:
1.) They will angle the “floor” surface in the gap between the two structures to ensure no rain water can settle, that will lead out to a drain
2.) They will look to mitigate the water/debris from entering the gap in the first place by installing guttering over the gap so it blocks any water from falling down and just runs the water down the guttering structure.
I am not familiar with any of this, but the angle surface in the gap I imagine that is below the DPC. But gutters do leak or fail over time, so it does not sound like an ideal long term solution in my mind.
Just being cautious here and looking into the future. If this is not done properly from the outset, it could become both our problem or I may be overthinking. Nevertheless they are looking at ways to mitigate.
There are a few threads on the subject. However I am no surveyor or builder, so I want some input on what would be the best approach on extension spacing and damp mitigation, based on experience. And if anything to discuss before that wall goes up.
The neighbours are building a 4 meter extension right next to our existing one, semi-detached houses. We have already consulted with each other and their builder intends to leave a bit more than 100mm gap between walls. Our extension is pitched with tiles, theirs will come at lower height as a flat roof (~3metres tall), potentially meeting our eaves at same height.
While researching on issue of damp, I read from a surveyor the proposed solution for debris and damp prevention, is by way of lead flashing chasing our side wall render and bridge on their roof. So that it seals the highest point between walls to prevent things falling in.
When I put this to the neighbours, their builder responded with alternative:
1.) They will angle the “floor” surface in the gap between the two structures to ensure no rain water can settle, that will lead out to a drain
2.) They will look to mitigate the water/debris from entering the gap in the first place by installing guttering over the gap so it blocks any water from falling down and just runs the water down the guttering structure.
I am not familiar with any of this, but the angle surface in the gap I imagine that is below the DPC. But gutters do leak or fail over time, so it does not sound like an ideal long term solution in my mind.
Just being cautious here and looking into the future. If this is not done properly from the outset, it could become both our problem or I may be overthinking. Nevertheless they are looking at ways to mitigate.