b'A. In genera!, a roof should be replaced for the followingreasons: There are two or more roof assemblies in placealready. The structure cannot tolerate the additional weight. Excessive areas of moisture in the insulation andsystem. Attachment of existing roof assembly is in question. Condition of the roof deck is unknown and is questionable.by Bob Lacosse, CAEQ. What is the differencebetween the terms Q.What is thermal shock?"blackberry" and A. It is the stress producing phenomenon resulting from"blueberry"in roofing? sudden temperature changes in a roof membrane suchA. No difference, take as a sudden rain shower following brilliant sunshineyour pick-it is a small and/or warm damp weather to sudden freezing.blister orbubble in theflood coating of a Q. What is the difference between "spunbonded" andgravel surfaced built-up "spun laced"?roof membrane or on a A."Spun bonded"is a generic name for non-woven fabricsgranular surface of a formed directly from polymer chips spun into continmodified bitumen uous filaments that are laid down and bonded continmembrane. uously without an intermediate step."Spunlaced" is ahydrotangied non-woven fabric whereby a dry-laidQ. What reasons are staple fabric is mechanically bonded by water jet whichthere to replace a roof entangles the individual fibers.assembly instead ofadding another roof or recovering?MRCAISNOW ASTOP ONTHE INFORMATION SUPER HIGHWAY! MRCA is proud to announce that members can now contact their association 24 hoursa-day through computer electronic mail. Members can request information, publications, or send news and letters to MRCA, without leaving their computer. The E-Mail address for MRCA is America On Line CAOU@ MWRoof.REMINDER TOROOF WATCH PARTICIPANTS: QuarterlycontractsaredueDecember20th to participatein theFebruary1995issue.For more ._/ information,callTomThompsonat 913/843-4888. [5]'