Slate Roof Torching

Torching is a lime cement weather seal traditionally used inside old slate roofs.

Slate roof torching.

Although a slate roof is initially quite costly it will often last for a lifetime and beyond. In the days before roofing felt torching or lime mortar was used on the underside of tiles or slates to keep them in place and to prevent strong winds from getting under the tiles and lifting them. A new slate or salvaged slate which should match the size shape texture and weathered color of the old slate is then slid into place and held in position by one nail inserted through the vertical joint between the slates in the course above and approximately one inch below the tail of the slate two courses above. Torching is most commonly encountered to the underside of old stone slate roofs.

Slate roofs are no exception. Originally the only recognised roof under coating was the application of sand lime mortar reinforced with animal hair applied to the headlaps of double lapped slates or tiles. Nearly all old roofs were lime torched. This system was commonly known as torching and was used before the introduction.

This can be carried out cheaply and it s work you can comfortably undertake yourself. In order to maintain your investment and make sure it lasts a slate roof will need regular maintenance. The homebuyer survey noted the torching was dropping away and would need attention in the next year or two reported as amber. In the days before roofing felt torching or lime mortar was used on the underside of tiles or slates to keep them in place and to prevent strong winds from getting under the tiles and lifting them.

Traditional variations of a physical secondary barrier against wind driven snow and rain include reeds laid between the tiles and the battens and a coating of mortar known as torching to the underside of the tiles or slates. 1 2 the gradual decline of the stone slate roofing industry has led to a loss of expertise of both roofers and specifiers and there is little written information available on best practice methods for. The torching on clay tile roofs contributed to securing them in the days before nibs were added to hold them on the wooden battens. Quite a lot of it is missing and the rest looks like it won t last that long.

Whether slate clay tile or stone flags lime was used to bed the tile or beneath them to prevent undue wind and hold condensation. I bought a late 20s small three bed semi with a slate roof in september. Lime acts as a sponge to hold water and release it as conditions change. Thanks i never knew that so why use it now.