Roofing Services Scotland & Cumbria
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Gutter Sealant Leaking, Gutter Joints & Fixing Guttering Joints

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!

  1. Don’t hang out of windows Dormer’s Ext. to reach blocked gutters!
  2. Don’t over stretch at the top of the ladder!
  3. 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.

gutter joints

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.

Gutter sealant

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…

  1. Cleaned
  2. primed
  3. & sealed

Take a look and leave a comment if you need to get in touch we cover the whole of Cumbria, and West Scotland
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Jonathan Millican
Jonathan Millican
07:46 08 Oct 19
Called Abbey Roofing when i found a leak in the roof of the house that was causing rising damp. Jim came round within 24 hrs and was superb. The problem was quickly diagnosed and dealt with by the end of the week. Excellent job and great customer service. Would highly recommend to anyone.
Danny Bull
Danny Bull
16:22 30 Sep 19
robert murphy
robert murphy
12:51 28 Sep 19
Excellent service facsia and soffits capped and looking great, very quick and efficient would recommend and use again.
Sam Verry
Sam Verry
16:16 31 Aug 19
We needed some new guttering on an old property we recently purchased as the existing guttering was causing us some damp issues, Abbey roofing gave us a reasonable quote and started the work within a few days of us accepting the quote. The work was completed professionally and to a very high standard. I have since had abbey roofing back to carry out some work on the roof and again I am really pleased with the work. Would highly recommend these guys.
Lee Preston
Lee Preston
11:26 12 May 19
Looks great, top workmanship, efficiently done and in a short time!
08:16 25 Apr 18
Prompt response, arrived to look at job when he said, gave a thorough account of what needed done, we agreed a price. The next fine day he arrived early with another worker and job done before end of day. Prompt, efficient, professional and reliable. My old cast iron guttering now looks like new and doesn't leak....hurray! Thanks James.
james thomas
james thomas
17:48 08 Mar 18
I have used James and his roof firm twice now and have had fantastic service each time. He is very quick to provide advice and all his work is timely and of a great standard . I would happily recommend and will be using him again in future .
arron weaver
arron weaver
15:01 28 Oct 16
Great price, no hidden costs, professional and friendly service, the results were simply stunning. would recommend to anyone. Thank you to all the team. Great work!
Michael Seidelmann
Michael Seidelmann
14:56 14 Oct 16
Jim and his team have been carrying out several jobs at our cottage, including re-roofing and guttering. We are delighted with both the level of service and the quality of work. Happy to recommend.
Ed Hagerty
Ed Hagerty
19:31 13 Oct 16
We’ve been restoring a house in Cumbria and over the years we’ve had tradespeople from across the spectrum. I can comfortably say that Jim and his team are in the very top of the list in terms of quality, price and service. They did a flat roof for us, some lead work and a variety of other external work, all of the highest quality. If Jim provides the service, you need look nowhere else. We’d trust him with any job, large or small.
Katherine Massey
Katherine Massey
14:11 26 Mar 15
Jim and Chris recently carried out outstanding work to our fibreglass roof on a listed building. We were delighted with the standard of workmanship, service, communication and the 25 year guarantee. The work was carried out in a timely and professional manner and was also reasonable in terms of cost. We were lucky to get some dry weather and guys that really know what they are doing. Thanks Jim, much appreciated! I will recommend you to family, friends and anyone I come across!
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