Physics Engineering Hail Second Layer Roof

Multiple layers of roofing shingles can allow hail to cause damage to the shingles.

Physics engineering hail second layer roof.

As demonstrated in haag s 2010 report ice ball impact testing of roofing materials the typical threshold size for hail necessary to rupture metal panels in good to fair condition is at least 2 5 inches. When rust forms you ve just exponentially increased the amount of weathering that roof surface is going to experience. New shingle roof 7 500 average price. Hail will hit the shingle with force and the second layer of shingles will allow for a cushion which will cause a hail pot mark on the shingle.

When a hailstone impacts a fully adhered single ply roof system it is possible for the impact force. However four out of five houses in the united states are covered with asphalt shingles. Roof cover also referred as a membrane most low pitch membranes can be classified as built up roof membranes metal panel roof systems modified bitumen sheet membranes synthetic rubber. A sound epdm roof covering can withstand impact by hailstones up to 2 inches in diameter.

The age of the roof plays a big role in how vulnerable it is to wind or hail damage. New flat roof 8 225. Insulation one distinction from steep pitch roofing is that insulation is typically above the decking and may be replaced with the membrane layer. Too many commercial properties make the mistake of not replacing their roof soon enough since severe wind and hail events don t happen every day.

In extreme instances hail may puncture the epdm if the underlying substrate is soft or malleable. Hail caused dents to the roof panels i e. From an engineering perspective hail with sufficient mass hardness and impact energy can dent or rupture tear metal roofing materials. The membrane to a layer of polyisocyanurate polyiso insulation using an adhesive between the top of the insulation and the underside of the roof membrane to bond these layers to each other.

In a hail event a possible scenario is the metal roof gets painted and a piece of hail chips the paint. Hail caused punctures or tears to the roof panels or hail was large enough to cause distortion and or disengagement of the lap seams either of which allow water to immediately penetrate the roof assembly. Residential roofs are covered by a variety of materials including asphalt shingles metal concrete and clay tiles and fiber cement tiles. In the same manner your car operates when paint gets chipped rust begins to form.

If the shingles are still in a seemingly good shape but the roof has sustained significant storm or hail damage then it s probably time to consider replacement or partial replacement. When epdm roof coverings do sustain damage surface cracks can occur similar to thermoplastic membranes. Hail large enough in size possessing sufficient impact energy great enough to change the appearance of the roof panels with the hail caused dents resulting in no micro fractures or loss of coatings. You are less likely to see this hail damage on a roof with single layer of shingles.