Head Lap Roofing

The recommended length of step flashing is typically a minimum of 2 inches longer than the exposure of the roofing material.

Head lap roofing.

If you re installing a single sized slate such as 20 by 12 inches the slates should be installed so the joints are exactly split in two. Headlap is what keeps the water from penetrating through the roof. This helps to prevent water infiltration. Headlap is essen tially what renders the roof water tight.

The triple coverage portion of the top lap of strip shingles. 3m headlap roofing granules are a natural mineral product with a colored ceramic coating. How to lap metal roofing a basic rule of thumb for installing metal roofing is that the piece of roofing higher up on the slope should always overlap the one below it. Shortest distance from the butt edge of an overlapping shingle to the upper edge of a shingle in the second course below.

If there is no headlap the roof will leak. This lap must be supported underneath by a purlin to be secure and long lasting. The side laps on the whole roof should be 6 inches. Bs 5534 2014 is the code of practice for slating and tiling.

This results in a 2 inch minimum head lap. When i m asked to inspect a problematic new slate roof i find the side and head laps are the problems on a majority of all cases across the country. As with side lap roofing it s good practice to use lapping tape to help create a robust weather resistant joint. The triple coverage portion of the top lap of strip shingles.

The recommended width of step flashings will vary depending on the agency entity being referenced. Headlap is what renders the roof water tight. If there is no headlap the roof will leak. When the head of a slate is overlapped by the slate two courses above it that s called headlap that s the critical overlap on a slate roof figure 2.

3m headlap roofing granules combined in asphalt roofing shingles gives a roof extra protection against the elements of weather. When the head of a slate is overlapped by the slate two courses above it that s called headlap that s the critical overlap on a slate roof figure 2. The granules are a tough and durable element that will add appeal to any roof. Beacon building products nasdaq.

Side lap roofing end lap joints for end lap joints a minimum sheet over sheet overlap of 250mm should be allowed for where the sheets lap. Because of this you should start at the lowest part of the slope and work upward.