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Established 1893   |   BS 460:2002 Certified   |   UK & International Supply   |   Expert Technical Support   |   0333 987 4452

“Gutter Jointing Kit” has been added to your basket. View basket
Shop / Cast Iron Gutters & Pipes / Cast Iron Gutter & Pipe Accessories / U9 Black Silicone
U9 Black Silicone_cast iron gutter sealant
CODE U9BL Category Cast Iron Gutter & Pipe Accessories

U9 Black Silicone

£12.60 +VAT

Low modulas black silicone for common half round, ogee, deep half round, moulded G46 cast iron guttering and round pipes.

U9 Black Silicone is a low-modulus black silicone sealant formulated for jointing cast iron gutters and pipes. Low-modulus silicone remains flexible after curing, accommodating the thermal expansion and contraction that cast iron guttering undergoes through temperature cycles across the year without the joint cracking or losing adhesion. This flexibility makes it significantly more durable than standard frame or construction silicones on cast iron joints.

Supplied in black to match the standard factory black finish of cast iron gutters and pipes. Compatible with all standard cast iron gutter profiles: common half round, beaded half round, deep half round, moulded ogee, G46 moulded ogee, Notts OG, and No.46 moulded. Also suitable for ogee and moulded gutter joints where a flexible waterproof seal is required. For specification support, call 0333 987 4452.

Additional information

FAQ Categories

  • Cast Iron Airbricks
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All FAQ
Can the louvre airbrick be used to replace an existing cast iron ventilation grille?

Can the louvre airbrick be used to replace an existing cast iron ventilation grille?

Yes. The Louvre Airbrick is dimensioned to standard brick course openings and is suitable for direct replacement of worn, broken, or missing original cast iron louvre grilles. If you are unsure of the size required, measure the opening in the brickwork rather than the existing damaged grille.

We are refurbishing our bathroom and wish to place a heated towel rail in the new bathroom. Our plumber has advised that the heated towel warmer would be connected to the heating system, this would mean when we turn the system off in the summer that the towel rail will not work. What can we do ?

We are refurbishing our bathroom and wish to place a heated towel rail in the new bathroom. Our plumber has advised that the heated towel warmer would be connected to the heating system, this would mean when we turn the system off in the summer that the towel rail will not work. What can we do ?

It is possible for us to supply towel warmers with an electric heating element in them. The Electrad system is a unique system available to us, that enables independent heating of towel rails and radiators via the properties electrical system.

Are ornamental cast iron vents suitable for listed buildings?

Are ornamental cast iron vents suitable for listed buildings?

Yes. Cast iron ornamental vents in period patterns are frequently specified on listed buildings and conservation area properties as like-for-like replacements for original Victorian ironwork. Conservation officers generally accept cast iron in period patterns without objection. We can supply specifications to support planning and listed building consent applications.

Please can you advise whether we will require 1/2″ or 3/4″ BSP connections for our new cast iron radiator.

Please can you advise whether we will require 1/2″ or 3/4″ BSP connections for our new cast iron radiator.

All of our cast iron radiators are availbale as standard with a 1/2″ BSP (15mm) connection. We are though also able to supply many of our radiators and valves with 3/4″ BSP connections. Due to the size proportions of some radiators and valves 3/4″ connections may be more suitable.

How do I get a price for cast iron louvre airbricks?

How do I get a price for cast iron louvre airbricks?

Prices are shown on the product page. For project quantities, specification support, or a formal quotation, call 0333 987 4452 or use the contact form.

Why should I choose cast iron for my rainwater system?

Why should I choose cast iron for my rainwater system?

Most old buildings have cast iron rainwater systems that should be maintained and preserved however; these inherent benefits make cast iron an ideal choice for both traditional and modern installations. It is not uncommon to see modern alternative products marketed with terms like low maintenance or easy to install and cost effective. It has even been said that ‘plastic guttering systems provide a way of achieving a traditional look with modern convenience

As well as being easier to produce, the material enabled eaves gutters to be installed more simply, since lead could only be used in this location as a lining for timber gutters. Many modern materials focus on replicating the appearance of cast iron but those materials can vary rarely offer any of the benefits. Cast iron gutters and pipes offer great strength and durability, a proven history of long life, low noise operation and fire resistance.

Most old buildings have cast iron rainwater systems that should be maintained and preserved however; these inherent benefits make cast iron an ideal choice for both traditional and modern installations. It is not uncommon to see modern alternative products marketed with terms like low maintenance or easy to install and cost effective. It has even been said that ‘plastic guttering systems provide a way of achieving a traditional look with modern convenience’.

These terms tend to refer to possible cost savings rather than any real product benefits. It is also difficult to quantify the benefits of modern convenience over traditional build quality. It is worth remembering that all rainwater goods will require some element of maintaining to ensure they are unblocked by debris and remain functional. No rainwater system cleans itself.

Today most suppliers of cast iron rainwater systems offer products in both primer or pre-painted with a 10 year protective coating. When describing modern materials, the term ‘cost effective’ is used rather than simply saying cheap. There is no doubt that the initial cost of many modern materials is less than cast iron but you might be surprised to know that over its lifespan, cast iron will cost around a third of plastic.


What pipe connection sizes do your cast iron hopper heads accept?

What pipe connection sizes do your cast iron hopper heads accept?

Our hopper heads are available with a wide range of pipe connections to suit round, square, and rectangular downpipes. The Calnethorpe No.11 accepts round 65mm, 75mm, and 100mm; square 75×75mm, 100×100mm, and 125×125mm; and rectangular 100×75mm, 125×100mm, and 150×100mm. Connection options vary by model — please contact us to confirm availability for your chosen hopper.

We are looking to install a new heating system into a Georgian farmhouse and would like to know whether we would be better installing tubular steel column radiators or traditional cast iron radiators.

We are looking to install a new heating system into a Georgian farmhouse and would like to know whether we would be better installing tubular steel column radiators or traditional cast iron radiators.

Cast iron radiators cost no more to run than modern steel or aluminium radiators. Cast iron is a very efficient material at emitting heat, thus you have items like le creuset cast iron pans. Cast iron holds it’s heat extremly well, which means that the radiators stay warm for longer.

Do you sell or make ogee guttering as we have a round double bay turrett style roof to our victorian house.

Do you sell or make ogee guttering as we have a round double bay turrett style roof to our victorian house.

We do offer a range of Ogee patterned gutters in both straight and radius profiles. The straight profiles are much more common and as such cost less.

What building types is the Cast Iron Louvre Airbrick suited to?

What building types is the Cast Iron Louvre Airbrick suited to?

The Cast Iron Louvre Airbrick suits Victorian and Edwardian terraced housing, semi-detached properties, public houses, agricultural buildings, and workshop structures where the original airbrick was a louvre-face grille. The horizontal fin profile is widely found in British domestic and light industrial construction from the 1870s through to the 1950s.

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Find out more about our products by giving us a call
0333 987 4452

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