UL 2218-BULLETINS:2002 pdf download Request for Comments and Ballots on Proposed Requirements for the Proposed First Edition of the Standard for Test Method for Wind Resistant Asphalt Shingles with Sealed Tabs, UL 2390; PROPOSED EFFECTIVE DATE
STP Members:
if you are a voting member of the STP, complete the attached ballot(s) with your vote on the standardor proposals. Please note that all negative ballots must be accompanied by supporting written reasonsand, where possible, proposals for a solution to the problem raised.
lmpact statements and effective dates) information are not subject to letter ballot. Therefore, commentsregarding impact statements and effective dates may be made and should be sent to the STP Secretaryseparate from the letter ballot.
Subscribers and other interested parties:
if you are a subscriber or other interested party, you are requested to send comments on the proposedrequirement(s), impact statement(s), and proposed effective date(s) to the STP Secretary. The STPmember ballot should not be used to submit your comments.
Comments should be made in writing and may be sent by fax to (847) 313-2320 or by mail to theattention of Charles McCall at UL’s Northbrook office. Comments may also be sent via E-mail [email protected]. Please reference all correspondence to Subject 2390. Note all commentsreceived are public and may be circulated to others. lf you respond by fax or E-mail, please includeyour full name and company name and address to ensure a reply.
SUMMARY OF TOPICS
This bulletin proposes the following changes in requirements:
Proposed first edition of the Standard for Test Method for Wind Resistant Asphalt Shingles withSealed Tabs
STP BALLOTS AND ALL COMMENTS DUE: Apri 30, 2002
Attached as Appendix A for your review and comment are proposed requirements for UL 2390.Attached as Appendix B for your review and comment are the impact statement(s) and proposedeffective date(s). Attached as Appendix C, D, and E are the STP membership roster, STP BallotInstructions, and the STP ballot(s), respectively. Questions regarding interpretation of requirementsshould be directed to the responsible UL Staff. Please see Appendix F of this bulletin regardingdesignated responsibility for the subject product categories.
Please note that proposed requirements are of a tentative and early nature and are for review andcomment only. Current requirements are to be used to judge a product until these requirements arepublished in final form.
RATIONALE
Several years ago research sponsored by the Asphalt Roofing Manufacturers Association (ARMA) wasbegun. The research concerned the behavior of in-place asphalt shingles under various wind loadsand the development of a prediction model for asphalt shingles to improve shingle wind resistanceperformance with a focus on the tab sealant. The ARMA-sponsored research was conducted by windengineering experts and by other involved and interested parties. UL participated in a peer reviewof this research work as well, and the proposed UL 2390 test standard is an outgrowth of the researchwork
The test method consists of measuring uplift coefficients (DCp’s) on a shingle tab subjected to an airflow across its surface from which to calculate the force acting on the tab sealant as a function of windspeed. In high winds, the edge of the shingle extending outward from the sealant strip will deflectupward causing the uplift pressure on the shingle to increase. This corresponds to an increase in themeasured uplift coefficient DCp. Since the deflected shape wil not occur naturally at the low wind speedof this test method the deflection is produced by shims placed under the edge of the shingle tab. Themethod to determine the shim height is also described in the test method.
Unless specifically requested to do so, UL will not acknowledge comments indicating concurrence withthese proposals.
UL 2218-BULLETINS:2002 pdf download
PS:Thank you for your support!
