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.

Physics engineering hail second layer roof.

From an engineering perspective hail with sufficient mass hardness and impact energy can dent or rupture tear metal roofing materials. When epdm roof coverings do sustain damage surface cracks can occur similar to thermoplastic membranes. However four out of five houses in the united states are covered with asphalt shingles. The age of the roof plays a big role in how vulnerable it is to wind or hail damage.

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. 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. 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.

In the same manner your car operates when paint gets chipped rust begins to form. A sound epdm roof covering can withstand impact by hailstones up to 2 inches in diameter. You are less likely to see this hail damage on a roof with single layer of shingles. Hail damage to roofing materials is defined as an identifiable mark caused by hail that has measurably reduced the integrity or functionality of the overall material where the material was sound prior to the hail impact.

When rust forms you ve just exponentially increased the amount of weathering that roof surface is going to experience. 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. 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. Any structural engineering company will highly recommend conducting roof inspections often.

New flat roof 8 225. 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. New metal roof 14 500 average price. New shingle roof 7 500 average price.

Multiple layers of roofing shingles can allow hail to cause damage to the shingles. Insulation one distinction from steep pitch roofing is that insulation is typically above the decking and may be replaced with the membrane layer. When a hailstone impacts a fully adhered single ply roof system it is possible for the impact force. 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.