Urbana Roofers: Article About Open Metal In A Roof Valley
It is popular to have many gables on a roof in contemporary residential housing design. Having many gables means many valleys for Urbana roofers to cover and waterproof. There are several methods for covering a valley, and all of them have advantages and disadvantages. One method to cover a valley and waterproof it is by using metal and leaving it open instead of covering it with shingles or other roofing materials.
An advantage of using open metal to cover a valley is its attractive appearance. Metal looks good next to whatever type of shingles are being used: composite, wood, tile or slate. Open metal looks especially good with laminated shingles.
Perhaps the biggest disadvantage of using open metal to cover a valley is that it is more expensive than other methods like weaving shingles together. Another disadvantage is that the metal liner has to be pre fabricated. This means extra expense and usually involves working with a machine shop.
Copper, steel and aluminum are all common metal choices for covering a valley. Of the three, copper is the sturdiest and arguably looks the best but is the most expensive.
To begin the process of installing open metal in a valley, the roof must first be cleared down to the deck.
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Any protruding nails or debris from previous roofing can cause problems down the line. Any rotten wood found in the sheathing must be removed and replaced before the new roofing is installed. Then, the drip edge should be installed on the eaves.
Next, some type of waterproof underlayment is laid down on the roof deck. Two strips overlap at the valley. Both strips are fitted under the drip edge. Finally, a third strip of underlayment is laid down directly in the valley from the eaves to the ridge of the roof. Laying down a chalk line beforehand can help keep this strip straight.
The metal liner is attached next. It should be prefabricated in a machine shop. The liner is usually two to three feet wide and in sections of no more than eight feet long. An inverted V shape an inch high can be prefabricated into the trough of the valley to help move water down the center of the valley instead of sloshing back and forth.
The metal liner is attached to the valley of the roof using nails on the edges every 12 inches to 16 inches apart. The nails must not penetrate the metal itself but rather hold it down at the edges. Clips can also be used to accomplish this. Finally, shingles are fastened to overlap the edges of the liner by at least six inches.