The best cast iron guttering sealant
We have come across is desmopol pure polyurethane Gutter sealant
liquid applied in a seamless liner inside the guttering ideal for old cast-iron gutters and leaking gutter joints.
This terraced house pictured in Carlisle, Cumbria, had cast-iron guttering leaking on all the joins, one above the front door, the profile of the gutter is different to modern guttering so a replacement would’ve been difficult to match with the neighbours,
So, we went with a repair, with all the guttering needed to be clean and dry so we waited for the right whether to start,
how to seal leaking gutter joints
First dry day we got to work.
- Found the leaking gutter joints
- Cleaned, dried and wire brushed the internal gutter surface Inc. joints
- Drilled out the old bolts (Just fell out really)
- Sealed the gutter joints with low modulus silicone sealant
- Replaced the broken gutter fixing with bolt’s and washer’s
- And then lined the internal surface of the leaking guttering
This cast-iron was in pretty good shape except for the joint’s its a block of 6 or 7 houses probably… 35 to 40 meters long but only two down pipes, that’s the issue its a very long run with very little fall there easily blocked
The main thing we found over the years is with the older cast-iron gutters originally the joints will have been sealed with Linseed Oil Putty fixed together with a threaded nut bolt and washer, the putty eventually dries out and courses the lengths of half round guttering to come loose the nut and bolts will rust away and once the bolts rust away it’s time for a gutter repair, or to be replaced, some solid wall building have nowhere to fix guttering brackets to, if this is the case we can fix rise and fall brackets for stone walls,
Leaking Gutter Joints
They can course lots of damage to your property most common is bringing the render of the walls this is coursed by wet walls freezing and becoming frost damaged loosing parts of the external render, we’ve seen mould and in older building can lead to wet rot, and dry rot, it’s not to be taken lightly.
DIY Gutter Repair & Gutter sealant
Sometimes the guttering leaking can be the simplest of things to fix yourself but be careful with heights.
It’s not worth it. If it doesn’t feel safe it probably isn’t!
- Don’t hang out of windows Dormer’s Ext. to reach blocked gutters!
- Don’t over stretch at the top of the ladder!
- Make sure the gutters are secure to place the ladders on cast guttering can be very heavy if it falls
And don’t forget – if the downpipes are blocked the gutter will back up and overflow,
down pipes can be cut if needs be, PVC pipes are easy just cut straight through near the bottom unblock and buy a pipe connector to join it, cast-iron is a bit more difficult you will need a grinder or saw with a metal blade but be sure to get the diameters fist for the connector has there very difficult to get for a cast pipe, Also check for wires running down the back of the pipe like sky cables, TV wires.
Pictured is an old cast-iron gutter repair we did in Whitehaven, Cumbria.
This Georgian style house has large gutters back and front all leaking at the joints.
The cast-iron was cleaned wire brushed internally all the joints bolted with Gutter sealant & Desmopol primer for cast-iron sealed with Desmopol because the guttering really large we bandaged the joints for reinforcment and we was able too give the manufacturer guarantee of 10-year’s
Here’s a video of us using Desmopol for sealing concrete steps with the same process has the gutter fix…
- & sealed
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