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What is a GRP Valley?

Author

Michael Henderson

Updated on March 11, 2026

What is a GRP Valley?

All our valley troughs are made from glass-reinforced plastic (GRP), an excellent alternative to lead. Dry fix valley troughs are mortar-free, providing hidden water gulleys at the roof valleys. Firstly, when compared with lead, GRP products take half as much time and cost to install.

Correspondingly, what is a lead Valley?

Lead lined valley. One of the areas of a pitched roof most prone to leakage if not constructed properly, is the valley. It is an area where water is directed towards, rather than away from, therefore correct detailing and construction is essential.

Also, what are Valley boards? Definition of valley board. : a board placed for the reception of the lead gutter in the valley of a roof.

Keeping this in consideration, how wide should a lead valley be?

The tiles should be bedded in mortar, leaving a minimum 100mm wide channel (125mm minimum for pitches below 30°). Lead-lined valleys should be Code 4 (colour coded blue) or Code 5 (colour coded red) and supported on gutter boards of 19mm thick marine ply or as specified.

How do you fit Klober dry valley?

The Klober dry valley troughs are fitted onto the valley boards and should be firmly fixed from the Easy-Form® section upwards, using suitable large headed roofing nails on either side of the trough and through the top flat section of the water bar, at a minimum of 500mm centres.

Is there dry land in Antarctica?

The McMurdo Dry Valleys are a row of largely snow-free valleys in Antarctica, located within Victoria Land west of McMurdo Sound. The Dry Valleys experience extremely low humidity and surrounding mountains prevent the flow of ice from nearby glaciers.

What is Dry Verge?

Dry verge is a product that is used where the tiles of a roof finish on an open edge on the side of the roof slope, which is often referred to as the gable on a double pitched roof.

How do you attach lead flashing?

The most common method of fixing lead flashing is to make a lead bung or 'chock'. This is made by rolling up a 25mm or less strip of lead into an oval shape just wider than the mortar chase you are fixing, then driving it below the surface of bricks to form a wedge.

What is a hidden valley gutter?

A valley gutter is where two main roofs meet or where there is a change in roof direction. Valley gutters are generally considered to be a problem area. The valley gutter problem areas can be made worse where there are surrounding trees and associated leaves and branches that can block the valley gutters up.

What is a roof Gulley?

The roof valley is that part of the roof where two sloping roofs meet together, where rainwater has to be channelled downwards into a gutter. Labour is often the most expensive part of a quote for any roof related repairs, so it makes sense to get any roof repairs done at the same.

What does Code 4 lead flashing mean?

Code 4 lead flashing is used for a range of roofing applications, including soakers, flashings and vertical cladding. It's 1.8mm thick and weighs 20.41 kg/m2. This makes it a malleable and workable product that can be used easily in a wide range of settings.

What's the difference between Code 3 and Code 4 lead?

While Code 3 is suitable for soakers, Code 4 is the minimum thickness to use for all flashings. An alternative method for more exposed situations is a single-step flashing which can be used over soakers, cover flashings or secret gutters. 15 All dimensions are in mm, except where otherwise stated.

What is Valley Code lead?

Code 8 Lead
In most circumstances it will be used on flat roofing where resting water is common. You can also use Code 8 lead on parapets, valley, dormers and various other projects.

Can you nail lead flashing?

In particular, each piece of flashing must be no longer than 1.5m. Fixings should hold the lead securely in position without restricting thermal movement. Nails and screws should have a similar life expectancy to that of the lead, therefore use copper, brass or stainless steel, never galvanised or aluminium fixings.

What is Code 3 lead?

Code 3 lead is the thinnest gauge of lead used in commercial roofing and is suitable for light applications such as soakers at the abutment.. As it is a thin gauge, Code 3 lead is easy to work with and, as with all lead flashing, the low melting point of lead means that you don't use as much fuel to melt the material.

What is a Layboard?

lay board. A board which is fixed on the rafters of a pitched roof to take the feet of the rafters, forming a subsidiary roof transverse to the main roof.

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