Graphical Construction Glossary >> Roofs and roofing. >> Roof Features >> Flashing

Flashing

A strip of sleeve of impervious material, or a non-ferrous metal or coated steel material that is formed to stop the entry of water.

Hip-flashing (PM)

The PM-flashing of a hip over a roof sheeted with roll formed steel roofing.

PM-flashing

"Pressed metal" material usually 0.9mm thick in the same finish as the roofing. It is cut to length and width in a guillotine and then shaped in a brake press. The lengths of the individual flashings are governed by the size of the machine available. 6M. is common.

Penetration-flashing

Any type of flashing that seals an object that passes through a roof. In particular now associated with proprietary fittings to suit various circular holes in roofs. i.e. vent pipes or extractor pipes.

A typical pressed metal (PM) hip-flashing formed out of the same material the the corrugated sheets are and with fixings of the same colour. More on these flashings.

More PM-flashings in the natural Galvalume colour. You can maybe pick out the ridge cap, a large valley gutter and a traditional style rolled edge verge capping, along with a few trims around the corrugated wall cladding.

A very small penetration fitting for sealing around circular roof penetration. These use a combination of EPDM rubber and a soft fairly malleable alloy. This one is on a flat surface, but they can be moulded around various roof profiles.

The are available in various sizes and there are ones that can be retro-fit. That is they can be fitted around existing stack pipes without having to slip them over the top of the pipe.

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