HYDROCARBONS

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Author Message Gerard Sanchis Senior Member Username: gerard_sanchis Post Number: 82 Registered: 10-2009 Posted on Tuesday, August 07, 2012 - 03:40 pm:    We need to specify a flexible flashing material that is unaffected by hydrocarbons (it will be used in contaminated soils). We thought of using neoprene, but it turns out that the material is affected by hydrocarbons. PVC is out of the question. Does anyone know of a material that would meet our criteria? Lynn Javoroski FCSI CCS LEEDŽ AP SCIP Affiliate Senior Member Username: lynn_javoroski Post Number: 1537 Registered: 07-2002 Posted on Tuesday, August 07, 2012 - 03:46 pm:    What about the roofing membrane Epichlorohydrin sheet? You could check with an EPDM manufacturer for applicability as flashing, but I should think it would work. It's supposed to be resistant to hydrocarbons. We use it where kitchen exhaust hits a roof. spiper (Unregistered Guest) Unregistered guest Posted on Tuesday, August 07, 2012 - 04:47 pm:    I think the type of hydrocarbon is going to be the issue. I would guess this a petroleum based contamination and EPDM is not necessarily resistant to that. I do believe there are some EPDM formulations that will work but the type of contaminent is going to determine the solution. Hydrocarbons run the gamet from crude oil to beeswax so more specific information on what you have to resist will probably be required before you can specify with any confidence. John Bunzick, CCS, CCCA, LEED AP Senior Member Username: bunzick Post Number: 1433 Registered: 03-2002 Posted on Tuesday, August 07, 2012 - 05:13 pm:    I would look into the pond liner membranes used for containment where contaminated soils are found. Often these are used in brownfields where conditions don't require removal of soil, but where gasses exist that must be blocked. You might check with a hazmat or geotech consultant for ideas. ken hercenberg Senior Member Username: khercenberg Post Number: 323 Registered: 12-2006 Posted on Wednesday, August 08, 2012 - 09:42 am:    I think you may have to consider PVC and KEE technologies. Sarnafil might be able to help but it depends on the hydrocarbon as noted above. Cetco has a new CoreFlex membrane that is bentonite free but I believe it's KEE which is a modified PVC. Just curious, why no PVC? Best option I know of otherwise? Stainless steel sheet. Richard L Matteo, AIA, CSI, CCS Senior Member Username: rlmat Post Number: 526 Registered: 10-2003 Posted on Wednesday, August 08, 2012 - 11:18 am:    I just worked on some specs for underground tunnel work and hydraulic elevator casings. The material you want to use is HDPE (High Density Polyethylene) Steven Bruneel, AIA, CSI-CDT, LEED-AP, EDAC Senior Member Username: redseca2 Post Number: 360 Registered: 12-2006 Posted on Wednesday, August 08, 2012 - 02:25 pm:    I second HDPE per Richard's comment. A project in San Francisco several years ago included 6 levels of underground parking (90 foot excavation) that passed through several perched water tables. A former gas station on a nearby site had leaked hydrocarbons (gasoline) into the soil. As we reviewed various below grade waterproofing systems for what would be a "blind-side" system installed against the excavation lagging, most of the well known below grade waterproofing manufacturers backed out due to incompatibility with the hydrocarbons. We finally settled on Paraseal LG, a system composed of an HDPE sheet membrane bonded with Bentonite Gerard Sanchis Senior Member Username: gerard_sanchis Post Number: 83 Registered: 10-2009 Posted on Friday, August 10, 2012 - 05:31 pm:    In answer to Ken, PVC as marketed by Sarnafil does not like hydrocarbon and grease - watch those kitchen exhaust fans on PVC roofs. Animal fats will melt the PVC and petroleum products will do the same. KEE seems to perform better under these conditions. We're still looking into the other suggestions and HDPE may win the gold.