We service and repair the following roof systems: TPO, PVC, EPDM, Hypalon, Asphalt and Gravel, Coal Tar Pitch, Modified Bitumen, and Metal Roof Systems. Houston, TX – Commercial Roof Using TPO. Common Roofing Troubles, Causes, and Preventions The downside to this roof coating is it may need to be applied in several coating to get the result coverage desired, requiring up to 4 gallons per 100 square feet. Strengthen your flat roof with a single ply or modified bitumen system, so it can better withstand temperature fluctuations, weight, and stress. The following KARNAK Roof Restoration System is intended to be applied over sound, dry, existing smooth built-up asphalt and smooth or granular modified bitumen or granular cap sheet roofing systems with positive drainage. MB 100 Geogard It has the advantage of multiple layers, but needs fewer layers than built up roofing and is less messy to apply. In the remaining inverted roof and warm roof systems, with membranes under a heavy Built Up Roofing Phoenix & Mesa See Why We Recommend Flat Roofing in Toronto. and C4 (APP modified bitumen, factory-surfaced with mineral granules), although free of visual defects such as alligatoring, wrinkling, ridging or shrinkage, yet showed a quite meaningful loss of mineral granules, but proved to be satisfactorily protected. This heat gain can cause several damaging effects to your modified bitumen … Too far gone for a restoration, we reviewed a variety of options with the customer and ultimately decided on a TPO solution. This 50,000 sq. Use to adhere SBS modified bitumen membranes, base and ply sheets, fully granulated cap sheets, etc. It is often used to level an existing roof that has “alligatoring” and other irregularities found on built-up and modified bitumen roofing. In addition, poor installation of flashing and roof backwater lap are other possible causes of leaks in torch-applied modified bitumen roofs. Modified Bitumen Roofing . Ponding ... Give one example of ultraviolet protection that is typically used on modified bitumen single ply roofing. A. These reinforced rolled sheets can be adhered by; using hot asphalt, fused by torching the sheets together or cold applied using adhesives or peel & stick. Cracking and alligatoring inevitably follows, allowing water to penetrate the system causing blisters, and cracks. Alligatoring occurs when the bitumen coating is hardened (oxidized) by sunlight. Durability . Fish mouths 10. Fill the void underneath the membrane with bitumen and then press the membrane back into place. Prepare the roof surface by high pressure washing with water at a pressure of 2,000 psi to 3,000 psi to remove dirt, miscellaneous soils, oily films, and the brown chalky residue, which develops on the surface of many smooth Modified Bitumen membranes over time. This is a modified bitumen roof that appears to be in fairly good condition but looks like it is pulling apart at the parapet walls where there are openings. While the built-up system is prized for its tensile strength, its ability to hold strong against building movement, the modified bitumen cap sheet allows flexibility. Modified bitumen. Excellent adhesion to clean asphalt surfaces. 3) In base flashing, the first ply, the cap sheet and the whole base flashing can be referred to as the base sheet. All of our roof installations are backed by our own two-year warranties. freien srpoeocft ions S slippage ROOF PROBLEMS cracks and splits plant life ... alligatoring split flashing empty pitch pan wind erosion & exposed felts curls, wrinkles, ridges & blisters clogged drains cracked coping & mortar joints Surface can then be coated with However, modified bitumen roofs are at risk of damage due to debris and impacts from hail and falling tree branches. Similarly, modified-bitumen roofing, pictured above on the left, is also installed in multiple layers but uses rolls of asphalt roofing in place of tar and gravel. Exposure. Modified Bitumen Flat Roofs. Built Up Roofs and Modified Bitumen A built up roof is comprised of layers of reinforcing felt between asphalt or tar. Prolonged cracking and splitting of rubber roof material means that your roof is nearing the end of its life cycle. A continuous, relatively inflexible roof assembly consisting of plies (usually 3 or 4) of saturated felts or fabrics between which layers of bitumen (asphalt, pitch, or modified rubberized asphalt) is applied. ponding clogged drains cracked coping & mortar joints and wind erosion & exposed felts empty pitch pan ... up or modified bitumen roof system to help you select the right system for your budget and roofing needs. There is a catch, however: removing the old roof can double the price of a roofing job. As plasticizers leach out of the asphalt, a modified bitumen or “mod bit” roof becomes brittle. alligatoring and hardening •Meets ASTM D - 1227, Type II, Class 1 recommeNded SuBStrateS Recommended for resurfacing extremely dried-out or heavily alligatored surfaces on smooth built-up and modified bitumen roofs. Over time, prolonged sunlight and heat exposure will cause multiple splits on your modified bitumen roof. Similar to the cracks seen on a neglected, aged asphalt parking lot, alligatoring on a roof has a similar cracking and splitting appearance like an alligator’s skin. In the remaining inverted roof and warm roof systems, with membranes under a heavy ponding clogged drains cracked coping & mortar joints and wind erosion & exposed felts empty pitch pan ... up or modified bitumen roof system to help you select the right system for your budget and roofing needs. While light, careful walking on a modified bitumen roof may be acceptable for the purpose of inspection or maintenance, on a balcony where regular walking is anticipated, the roof will not wear well. Second, in the same photograph we don't see any melted runout at the heated, lapped roofing seam. All wet insulation must be removed A good solution here is to use a cold applied modified bitumen cap sheet. Modified Bitumen. Modified Bitumen is a roofing membrane consisting of asphalt and plastic or rubber polymers, and is therefore widely considered an evolution of asphalt built up roofing. Surface can then be coated with ... modified bitumen roofs. This sheet can be applied by spudding the roof and applying a layer of asphalt over the damaged area. It contains a base sheet with no granule and a cap sheet with granule protection. Inspect modified bitumen roof to receive roof coating. Re-Roofing Whitco Roofing is a licensed, insured, and bonded expert at commercial roofing, industrial roofing, and institutional roofing needs of new and existing structures. Asphalt deterioration - which can lead to premature failure of roof. Surface Cracks and Splits: Address and seal all surface cracks and areas of alligatoring of built-up and modified bitumen roofs prior to coating with UNIFLEX Aluminum Coatings • High-performance primer • Highly alkali and efflorescence resistant • Can be applied to surfaces with a pH of 6 to 13 • Acts as a cleaning primer for EPDM : membranes by breaking the chemical bond of the inorganics on the surface of the rubber membrane, Seam failure inevitably follows causing leaks.A black modified bitumen roof absorbs a lot of the sun’s heat in the summer. There are two primary types of modified bitumen systems: atactic polypropylene (APP) and styrene-butadiene-styrene (SBS). What is the purpose of the asphalt,felts,in built up roof? Alligatoring To fix a roof that shows signs of alligatoring, you’ll need to apply a new coating to the roof. Liquid applied latex coatings 3. Silicone: When ponding resistance and UV protection are the focus for a metal roof coating, this is … This type of oxidation is a sure sign of an aged and damaged roof. While we explored PVC and TPO options . Don’t … There was severe alligatoring from shoddy repairs and whole swaths of modified bitumen that had separated from the roof. B _____ The cost to install a new modified bitumen roof is about $5 a square foot. prevent alligatoring and hardening • Meets ASTM D1227, Type II, Class 1 RECOMMENDED SUBSTRATES Recommended for resurfacing extremely dried-out or heavily alligatored surfaces on smooth built-up and modified bitumen roofs. 7142 Fiberless Seam Sealer is a unique rubber compound that is extremely effective for sealing fasteners, laps and penetrations on various roof surfaces. 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