Master Seal® Flow Cone Washers
Master Seal® washers are assembled to a wide variety of Leland Industries fasteners, including diaphragm screws utilized in Hansen Pole Buildings. Flow Cone Washers (US Patent #4292876) utilize vulcanized Grey or Black EPDM (Ethylene Propylene Diene Monomer) to special dished dome galvanized washers. This EPDM flows up into a cone shaped washer to seal around screw threads, fastener shank and under the fastener head providing a complete seal.
Steel-to-wood fastener for years was a ring shanked nail with a neoprene washer under nail head.
Why EPDM instead of neoprene?
As EPDM has increased in popularity, pricing has become more competitive and offers savings over neoprene in certain applications without compromising effectiveness.
EPDM and neoprene are both considered to be good all-purpose materials. They can be extruded and molded into a variety of sponge and dense products.
However, EPDM will be superior to neoprene in UV and Ozone resistance and may be more favorable when heat resistance factors in. EPDM seals also provide better flexibility during low temperatures compared to neoprene.
In testing, EPDM shows no signs of aging after 20 years of full exposure under equatorial sun. Both Greenpeace and “Green Building Digest” magazine rank EPDM as tops as far as having a low environmental impact. EPDM has a usable service life of 50+ years.
When it comes to strength and serviceability of post frame buildings, perhaps nothing becomes more important than only highest quality of fasteners. Without screws able to last as long as your building’s steel roofing and siding, your building’s lifespan (not to mention usability) could be severely compromised.
A core Hansen Pole Buildings value is to continually search for products delivering the best possible value for our clients. Diaphragm screws featuring Master Seal® Flow Cone Washers are just one of the many ways we look out for our clients’ best interests as part of delivering “The Ultimate Post Frame Building Experience”™.
Leaking Steel Roofing
Properly installed, there is truthfully no reason for a through screwed steel roof to leak. The key being “properly installed”.
Here is a report from a less than totally satisfied with his builder’s installation client:
“Sorry to report I have numerous leaks in the steel roof of my Hansen pole building. In examining the roof, the workmanship of the screw application left a lot to be desired. I have read your suggested fix in the manual and done some research on roof repairs etc. Most suggestions are the same as specified in your manual using a larger and longer size screw method.
I removed a couple screws where the leaking was taking place and discovered the screw had been rescrewed more than once on the initial install which reamed out the wood in the purlin and made the hole in the steel extra large (my little finger would fit in it). My Fix method: First a block was fastened to the existing purlin to give more wood as the screw tip had broken out on the side of the purlin indicating the screw was not inserted perpendicular to the roof and purlin. Then I attempted to fill the hole and placed a second little larger neoprene washer (so the original washer was on the top and the larger one was on the bottom and reinserted the screw. My thinking was the smaller washer on the top would exert enough pressure on the bottom washer which would cover the hole and provide the needed water seal. This did not work and I think a larger size head on the screw would have been better. In your opinion would a 14 or 16 x 2″ solve the problem?
Would appreciate any ideas on repairing the leaks.”
Mike the Pole Barn Guru Writes:
For any hole larger than 1/4″ the steel panel needs to be replaced, there is just no getting around it and no practical fix. For smaller holes, a #14 x 2″ screw will probably provide a fix. If it appears the hole in the purlin is large due to any one of a plethora of reasons, a small diameter wooden dowel or wooden matchstick driven into the hole prior to inserting the new screw will certainly aid in getting a good seal.