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Self repairing roof membrane

Inactive Publication Date: 2009-04-23
CARLISLE INTANGIBLE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0003]The present invention is based on the concept that damage to a roofing membrane can be repaired in-situ by the incorporation of a water swellable polymer layer in the membrane structure. The water swellable polymer, or, super absorbent polymer forms a hydrogel when in contact with water. If a tear in the membrane forms, and water enters through the tear, and is absorbed by the water swellable polymer forming a hydrogel which expands and seals the tear, preventing water from entering the building.

Problems solved by technology

If the membrane is damaged, and a tear forms through the membrane, water can leak into the building.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023]Samples of various grades of water swellable polymer (WSP) impregnated on a nonwoven fabric were obtained from Neptco, Inc. Laboratory samples (about 0.060-0.070 inches) were prepared by placing the WSP impregnated nonwoven fabric between two pieces of uncured EPDM rubber, as shown in FIG. 2. Press-cure samples were obtained after heating at 320° F. for 35 minutes (2,000-5,000 psi). To simulate a cut in the membrane, a 1-inch gash was cut through the sample. A 3-inch×2-inch cylinder was positioned over the gash and adhered to the sample with plumbers putty. The system was tested by dripping 25 ml of water from a burette over a 1-minute period. After the WSP had swelled, an additional 150 ml of water was added to the system in the same manner over a 3-minute period. The amount of water that had passed through the system was recorded every hour. Using this system, leakage was slowed by 26.0-93.0%.

example 2

[0024]Samples were prepared by attaching the WSP impregnated nonwoven fabric to the bottom of a standard 0.045-inch EPDM membrane using a polyethylene hot melt adhesive (see FIG. 1).

[0025]Samples were damaged by cutting a 1-inch gash through the entire sample. The test assembly was prepared as previously described. Samples were tested by dripping 125 ml of water over a 10-minute period. Results were recorded every 15 minutes for one hour, and then after an additional hour. The results of the experiment are shown in Table 1.

TABLE 1Self Repairing Membrane, WSP nonwoven on bottom of membraneTime (min)Control123Water through sample (ml)15111 (88.8%)1 (0.8%) 2 (1.6%) 5 (4%)30 12 (85%)010 (8%) 9 (7.5%)45 0017 (15%)30 (27.5%)60 00 0 0120  00 0 0Total123 (98.4%)1 (0.8%)29 (23.2%)39 (31.2%)

[0026]The control leaked about 89% of the water introduced in the system within the first 15 minutes, and 85% of the remaining water over the following 15 minutes. In one case, the experimental sample leak...

example 3

[0028]Samples were prepared by attaching the WSP nonwoven to the bottom of a membrane as previously described (see FIG. 1). The membrane and nonwoven composite were adhered to two pieces of polyisocyanurate insulation with Carlisle Sure-Seal 90-8-30A Bonding Adhesive. Damage was introduced to the system with two ½-inch, 45° cuts into the membrane simulating a tear. In order to investigate a worst case scenario, the damage was inflicted over the void space between the two pieces of insulation. The test assembly was prepared as previously described.

[0029]Water was introduced to the system via a burette at the rate of 125 ml (volume of about 1.75 in) over a 15-minute period to simulate a heavy rainstorm. Results were recorded every 15 minutes for one hour, and then after an additional hour. The results of the experiment are shown in Table 2.

TABLE 2Prototype testing - Simulated Tear ResultsTime (min)Control123Water through sample (ml)15125151530—0.501645—0.501560—0.50120 —10Total125 (10...

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Abstract

A self repairing roof membrane includes a water impervious layer such as EPDM covering a layer including a water swellable polymer. Preferably, the water swellable polymer is bound to a nonwoven web. If a tear is formed through the membrane, water that passes through the tear will be absorbed by the water swellable polymer, which will form a hydrogel and plug the tear.

Description

BACKGROUND OF THE INVENTION[0001]Single ply membrane roofing utilizes a polymeric sheet as the exterior surface of a roof structure. The sheets, which can be 7-50 feet in width, are positioned on the roof. In order to cover the entire roof, multiple sheets are positioned side by side, and the overlapped edges are adhered together to form a seam. This forms a continuous membrane, covering the entire roof.[0002]The membrane can be attached to the roof in a variety of different ways. Adhesive can be used, as well as ballast, i.e., gravel, as well as various types of mechanical fastening systems. The obvious purpose of the membrane is to prevent water from entering the building. If the membrane is damaged, and a tear forms through the membrane, water can leak into the building. Therefore, such tears must be repaired.SUMMARY OF THE INVENTION[0003]The present invention is based on the concept that damage to a roofing membrane can be repaired in-situ by the incorporation of a water swellab...

Claims

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Application Information

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IPC IPC(8): E04D5/10
CPCE04D5/10B32B11/10B32B25/10B32B25/14B32B2419/06B32B27/32B32B2274/00B32B2307/7265B32B27/304
Inventor TRIAL, THIERRY TIMOTHY
Owner CARLISLE INTANGIBLE LLC
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