Condensation in Dorchester: drainage
Drainage paths, and why they decide the outcome in Dorchester. Ask us to check and flush the drainage channels while we are on site — it is part of the survey, not an extra.
Ask us to check and flush the drainage channels while we are on site — it is part of the survey, not an extra.
Every modern frame is designed to leak in a controlled way. Rain that gets past the outer bead is meant to fall into a chamber, run along a channel and escape through slotted holes cut into the underside of the outer face. Those slots are the smallest part of the whole assembly and the first thing to silt up.
Drainage paths, and why they decide the outcome in Dorchester
Every modern frame is designed to leak in a controlled way. Rain that gets past the outer bead is meant to fall into a chamber, run along a channel and escape through slotted holes cut into the underside of the outer face. Those slots are the smallest part of the whole assembly and the first thing to silt up.
Blocked slots turn the chamber into a reservoir. Standing water sits against the edge tape, the bead foot and the lower corner welds, and everything above it ages faster than it should. Clearing the channels with a probe and flushing them takes minutes and is often the single highest-value thing done on a visit.
Baffles matter too. The little plastic caps over the outside of each slot stop wind driving water back uphill; when they snap off, wind-driven rain is pushed inward instead of drained outward, which is why exposed elevations behave so differently from sheltered ones.
Condensation Dorchester: drainage
Frequently. Water that cannot escape the chamber stays in contact with edge seals and bead feet, and that contact time is what does the damage rather than the rain itself.
Condensation Dorchester: drainage
Baffles matter too. The little plastic caps over the outside of each slot stop wind driving water back uphill; when they snap off, wind-driven rain is pushed inward instead of drained outward, which is why exposed elevations behave so differently from sheltered ones.
drainage decision path for Condensation in Dorchester
Blocked slots turn the chamber into a reservoir. Standing water sits against the edge tape, the bead foot and the lower corner welds, and everything above it ages faster than it should. Clearing the channels with a probe and flushing them takes minutes and is often the single highest-value thing done on a visit.
Condensation Dorchester: drainage
- Condensation in Dorchester: Can blocked drainage slots really cause this? — what matters for Georgian High West Street townhouses?
- Frequently. Water that cannot escape the chamber stays in contact with edge seals and bead feet, and that contact time is what does the damage rather than the rain itself.
Related services for Dorchester
Or go straight to the town pages: window replacements in Dorchester and window spraying in Dorchester.
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