1997-009106 (new residence) - Laserfiche WebLink

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Page 2 of 6 ER-4663 board joints must be over the framing.Plastic washers with the fas- masonry described in Section 2.3.4.See Figure 1 for typical installa- teners straddle the two boards at joints. The face of the washer tion details. should be flush to a maximum of 1/16 inch beneath the surface of the 2,4 Control Joints: insulation board. Horizontal control joints are required at each tloor line i❑ The base coat is then trowel-applied uniformly over the insulation �,�d-framed construction.The joints must be installed as specified board and the reinforcing mesh applied over the entire board surface by the architect,designer,builder or exterior coating manufacturer, with minimum 21/2-inch side and end laps.The mesh is completely in that order. embedded in the base coat and a smooth thickness of minimum i/16 inch is achieved.The base coat is then cured for a minimum of 24 2•5 Wind Design: hours. 2.5.1 General:Allowable transverse wiad pressures based on sys- The finish coat is then applied in the following manner: tems installed in accordance with this report,are set forth in this sec- tion.Design of the wood and steel framing must also be considered. 2.3.2.1 Sprint 100:Applied to a thickness of the largest aggregate Maximum allowable det7ectio❑ of structural wall components is in an open-textured pattern in regular or random style. 1/240 of span. 2.3.2.2 Sprint 200:Applied to a thickness of 11/2 times the aggre- 2.5.2 Wood Framing: When the system is applied to open-wood gate thickness which produces a lightly textured,saud-like appear- framing or wood-based s6eathings on framing as described in Sec- ance. tion 2.3,a positive wind pressure up to 40 pounds per square foot 2.3.3 Exterior Sheathings:The Dryvit Spnnt system can be applied and negative pressure up to 26 pounds per square foot is allowed. to unpaioted wood-based sheathings and to minimum 1/z-inch-thick 2.5.3 Steel Framing:W6en the system is applied to minimum No. water-resistant core gypsum sheathing. The sheathing must be 18 gage(0.0478)open-steel framing or solid sheathing on framing installed in accordance with the code.The Sprint system may then as described in Section 2.3, a positive wind pressure up to 51 be mechanically attached as described in Sectioo 2.3.2 for wood pounds per square foot and negative pressure up to 26 pounds per framing or adhesively attached as follows: square foot is allowed. The adhesive is applied to the back side of the insulation board and 2.5.4 Concrete or Concrete Masonry:Allowable wi�d pressure for spread over the entire surface with a U-notched trowel which pro- the system adhesively applied to concrete orconcrete masonry walls duces a 1/4-inch-wide by 3/g-inch-deep notch every 11/2 inches.The as described in Section 2.3.4 is 26 pounds per square foot,positive board is immediately pressed on to the substrate,slid into place and or negative. set.In addition to the adhesive,a minimum of eight mechanical fas- teners and washers as described in Sectio❑ 2.2.3 are required for 2•6 Identification: each 48-inch-wide by 96-inch-long insulation board.The base coat, Each container or package of material used as part of the Drwit reinforcing mesh,and finish coat are then applied as described for Sprint system bears the name and trademark of the manufacturer, open-wood framing in Section 23.2. the name of the product and expiration date.All Thermax Quik-R wall 2.3.4 Unpainted Masonry: Application of the system over insulation boards are identified with the product name,manufactur- unpainted concrete or concrete masonry is similar to adhesive er's name and/or trademark and the name and/or logo of Underwrit- application over eaRerior sheathing as described in Section 2.3.3. ers Laboratories Inc.(NER-QA403),the quality control agency. 2.3.5 Open-steel Framing: Attachment to open-steel framing is 3.0 EVIDENCE SUBMII"fED limited to minimum No. 18 gage(0.0478)studs at 16 inches on cen- Data showing compliance with Acceptance Criteria for Extenor ter.A weather-resistive barrier complying with Section 1402.1 of the Insulation and Finish Systems(AC24)dated January 1993,product code is applied over the studs.The insulatioo board is placed over brochures and installatiou instructions. the weather-resistive barrier with the long dimension vertical and attached with fasteners and pfastic washers described in Section 4.0 FINDINGS 2.2.3.The fastener spacing is 12 inches on center around the board That the Dryvit Sprint� Exterior Insulation and Finish System penmeter and to each stud. Fasteners must penetrate studs and described in this report complies with the 1994 Unijorm Building tracks a minimum of 3/g inch.The base coat,reinforcing mesh and Code'",subject to the following conditions: finish coats are then applied in a fashion similar to application over open-wood framing described in Section 2.3.2. 4.1 Construction is as set forth in Uus report and the manufac- turer's instructions. 2.3.6 Painted Masonry:The insulation board is pfaced against the 4.2 Insulation board is separated from the building interior cementitious surface and pilot holes drilled at 12 inches on center with a thermal barrier complying with Section 2602 of the around the board perime[er and vertically,and 16 inches on center code. horizontally. The board is the❑ fastened with minimum No. 10 masonry anchors with plastic washers as described in Section 2.2.3. 4.3 Installation is by applicators approved by Dryvit Systems, Adequacy of fasteners in cementitious substrates is determined ��• by a proof-load test program involving fastener withdrawal from the 4.4 Installarion is limited to exterior walls of Type V construc- substrate in question.Testing must be conducted by an iadepeadent tion. testing laboratory.The average withdrawal strength, in pounds per square foot must be six times the design wind pressure for the loca- 4.5 Installation cards as shown in Exhibits A and B must be tion in question. In no case is the system permitted in locations completed by the EIFS applicator and the sealant installer requiring greater than a 26 psf design wind pressure. and presented to We building official at the completion of each project. A minimum of five tests per program are required, with results varying no more than 15 percent from the average. A minimum of 4.6 Walls must be braced in accordance with Section 2326.11 10 tests per program may be provided regardless of variation from of the code. the average. For masonry substrates, 40 percent of the tests must 4.7 The local buffding official may require a vapor barrier on be run in masonry joints. the warm side of the insulation. The applicator must provide the building official with a certificate 1996 Accumulative Supplement:This report is unaffected by the supple- of compliance concerning test results relating to load requirements ment. in this report.The base coat,reinforcing mesh and finish coats are thea applied in a fashio❑ similar to application over unpainted This report is subject to re-exantination in two years.