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Homeowner Forum / Construction / June 2006Masonry question
What is the purpose of "rubber flashing" which is placed just below the first course of bricks ? I also see this same flashing on top of the last course of bricks just below the lentil. Thanks, Curt expansion which reduces the cracking > What is the purpose of "rubber flashing" which is placed just below the > first course of bricks ? I also see this same flashing on top of the last > course of bricks just below the lentil. > > Thanks, > Curt So the bricks are allowed to slide a bit ? > expansion which reduces the cracking > [quoted text clipped - 4 lines] >> Thanks, >> Curt i dont know about sliding so much expanding & contracting.... > So the bricks are allowed to slide a bit ? > [quoted text clipped - 6 lines] >>> Thanks, >>> Curt Point of interest: I relieved pressure on a brick wall some years ago from expansion. This wall was 300' long with no expansion joints or openings. It rested on a wall that went on down to the ground about 50' long on one end and 75' on the other end. The center was supported on steel with steel columns and was the entrance to parking under the main floor That wall built enough pressure to shear the support joints on either end and slid 2" on the short end and 1" on the other a total of 3" expansion. How much pressure that would take I have NO idea. Must have really popped when it first broke loose. Anyway when we set up a saw on the wall in 3 places and cut out vertical slivers to give it room, even then we had trouble because it would close up on the saw the pressure was so great. The 3" still hadn't relieved its pressure. Someone forgot to tell it was supposed to expand AND contract. :) >i dont know about sliding so much expanding & >contracting.... [quoted text clipped - 9 lines] >>>> Thanks, >>>> Curt The purpose of the rubberized membrane is to provide a thermal break. The rubber membrane has nothing to do with expansion control. Think about this for a moment as it is a real stretch of physics to suggest thousands of pounds of brick bearing on a steel member seperated by nothing more than a thin rubberized membrane provides any type of properties other than which it has been intended to provide; a thermal break which helps reduce condensation in the wall cavity. <%= Clinton Gallagher NET csgallagher AT metromilwaukee.com URL http://www.metromilwaukee.com/clintongallagher/ > Point of interest: I relieved pressure on a brick wall some years ago > from expansion. This wall was 300' long with no expansion joints or [quoted text clipped - 25 lines] >>>>> Thanks, >>>>> Curt > The purpose of the rubberized membrane is to provide a thermal break. > [quoted text clipped - 38 lines] > >>>>> Thanks, > >>>>> Curt It's my understanding that it's part of a drainage plane behind the brick to relieve trapped water/condensation to the weep holes that should be placed in the wall. > "crhras" <crhras@sbcglobal.net> wrote in message > > [quoted text clipped - 3 lines] > > > expansion which reduces the cracking Which direction would that allow the brick to move? Up? Expansion joints in brickwork are breaks in the brick bond with no mortar - the gaps are caulked. The flashing the OP is wondering about is a damproofing course. http://www.pavingexpert.com/dpc01.htm R http://www.masonrytechnology.com/mti/product_application.aspx?catid=10&subcatid=0 http://www.masonrytechnology.com/mti/product_application.aspx?catid=10&subcatid=0 > What is the purpose of "rubber flashing" which is placed just below the > first course of bricks ? I also see this same flashing on top of the last > course of bricks just below the lentil. > > Thanks, > Curt Look at the BIA (Brick Industry Association) web site. The Tech Notes section includes flashing. TB It's not a legume, it's a lintel. T ;) Lentil/Lintel Ha, I knew I had it wrong. Thanks for correcting me. :) >> What is the purpose of "rubber flashing" which is placed just below the >> first course of bricks ? I also see this same flashing on top of the [quoted text clipped - 10 lines] > It's not a legume, it's a lintel. > T ;) > What is the purpose of "rubber flashing" which is placed just below the > first course of bricks ? I also see this same flashing on top of the last > course of bricks just below the lentil. > > Thanks, > Curt DPC? What's that ? >> What is the purpose of "rubber flashing" which is placed just below the >> first course of bricks ? I also see this same flashing on top of the [quoted text clipped - 5 lines] > > DPC? > What's that ? > [quoted text clipped - 7 lines] > > > > DPC? DPC Damp Proofing Course or DPM Damp Proof Membrane |
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