Water Damage Repair · Cambridge
Water-Damaged Drywall Repair in Cambridge
Wet gypsum is not a thing that dries out and recovers. It is a thing that comes out, and the only question is how much and when.
Cambridge has more water-damage drywall work than its neighbours for a simple reason: two rivers run through its three old town centres. The low streets along the Grand in Galt and along the Speed in Preston and Hespeler have flooded in living memory, and even in an ordinary spring the rubble and block foundations of the older houses let groundwater through when the soil is saturated. Add the usual causes — a supply line that burst in a January cold snap, an ice dam over a bedroom, a shower surround that has leaked for a year — and water is behind a large share of the calls.
Why wet board comes out
Gypsum board is a plaster core between two paper faces. When it is soaked the core softens and loses strength, the fasteners pull through, and the paper — which is food for mould — stays damp long after the surface feels dry. Drying a flooded wall with fans and leaving the board in place is not a repair; it is a mould problem with a delay on it. The standard practice after flooding is to cut the board out to a line above the highest water mark, remove wet insulation behind it, and let the framing and cavity dry fully before anything is closed.
The sequence
- Stop the water. A plumber for the pipe, a roofer for the leak, a waterproofing or drainage contractor for a seeping foundation, and patience for a river. We do not re-board a wall whose source has not been dealt with, because that is a repair you pay for twice.
- Cut out and open up. Board removed above the water line, wet insulation out, baseboard off. In a flooded basement that is often the bottom metre or more of every wall.
- Dry and check. Framing and cavity dried with air movement and dehumidification until a moisture meter says so, not the calendar. Mould growth on framing is cleaned or, where it is extensive, becomes a remediation contractor's job before ours.
- Re-board and finish. New board, moisture-resistant where it makes sense, held off the slab, taped and finished to match the wall above. Baseboard back on.
Ceilings
A stained ceiling under a bathroom or a roof is the same logic overhead. If the board is soft or sagging it comes out and is replaced; if it is a light surface stain from a one-time event that was dried quickly, it can sometimes be stain-blocked and primed. A moisture meter and a hand decide which, not the colour of the stain. Pre-1990 textured ceilings are tested for asbestos before a soaked section is cut out, because a wet positive ceiling is still a positive ceiling.
Insurance and the record
Where a claim is involved, we write down what was found — the water line, the board and insulation removed, the moisture readings, the condition of the framing — and photograph it before closing up, because that is what an adjuster asks for. Whether a given event is covered is a question for the insurer, not us.
Rebuilding smarter in the flood streets
A basement that has flooded once in a riverside street may flood again. Finishing it the second time with board held well off the floor, a removable baseboard detail, no paper-faced board at the bottom course and nothing precious on the lower wall is a reasonable precaution and costs little more. Anyone in a GRCA regulated area planning a change to the building itself — a basement unit, say — should check the Conservation Authority's mapping before drawing plans; interior repair does not need their permission, but construction may.
Frequently asked questions
How much of the wall has to come out after a flood?
Board is cut to a line above the highest water mark, usually at a convenient height so the new joint lands cleanly, and wet insulation behind it comes out. In a basement that often means the bottom metre or more of every wall. Less than that leaves wet material in the cavity.
How long before you can re-board?
When the framing and cavity read dry on a meter, which is days with good air movement and dehumidification and longer in a cold, damp basement. Closing a wall early is the most common way a flood repair turns into a mould repair.
Can you fix the leak too?
No — the plumber, roofer or waterproofing contractor fixes the source. What we do is refuse to close the wall until it is fixed, and tell you plainly what we found so the right trade can deal with it.
Serving Cambridge and surrounding areas. Contact us for a no-obligation quote specific to your property.