Prepared for: American Frame Manufacturing Co Bristow Court, Unit B San Diego, CA Phone: Web:

Transcription

1 TESTING LISTING EVALUATION 257 EAST RANDOLPH STREET NAPPANEE, INDIANA PHONE: FAX: NEGATIVE WIND PRESSURE TEST ON EXTERIOR SHEATHING FOR MANUFACTURED HOUSING APPLICATIONS: SINGLE 2X4 STUD GRADE SPF ON 16-IN. CENTERS SHEATHED ON THE EXTERIOR WITH 3/8-IN. OSB SHEATHING AND ¾-IN. PANELS DÉCOR STONE SIDING AND SHEATHED ON THE INTERIOR WITH 5/16-IN. GYPSUM FOR 96-IN. TALL EXTERIOR WALLS WIND ZONE II, CORNER Prepared for: American Frame Manufacturing Co Bristow Court, Unit B San Diego, CA Phone: Web: Test Report: AFMCO Issued: October 22, 2013 Prepared By: Brad Wear Project Engineer Reviewed By: Douglas Berger, P.E. Program Engineer 10/22/13 This report contains only findings and results arrived at after employing the specific test procedures listed herein. It does not constitute a recommendation for, endorsement of, or certification of the product or material tested. NTA, Inc. makes no warranty, expressed or implied, except that the test has been performed, and a report prepared, based upon the specimen furnished by the client. Extrapolation of data, from the test data provided herein, to the batch or lot from which the specimens were obtained may not correlate and should be interpreted with extreme caution. NTA, Inc. assumes no responsibility for variations in quality, composition, appearance, performance, or other features of similar materials produced by the client, other persons, or under conditions over which NTA, Inc. has no control. NTA, Inc. has issued this report for the exclusive use of the client to whom it is addressed. Any use or duplication of this report shall not be made without their consent. This report shall only be reproduced in its entirety. AFMCO Page 1 of 18

2 1. INTRODUCTION NTA, Inc. conducted negative wind pressure load tests on assemblies constructed with Panels Décor Stone exterior siding for American Frame Manufacturing Co. The purpose of this evaluation is to assess the suitability of sheathing wall assemblies for use in manufactured home construction when subjected to simulated negative wind pressure in accordance with Section (b) of the Federal Manufactured Home Construction and Safety Standards (FMHCSS) 1. General test parameters and pass/fail criteria, in accordance with the FMHCSS, are summarized in Table 1, below. All tests were conducted at the NTA, Inc. test facility located in Nappanee, Indiana. Table 1: Test Parameters Parameter Value FMHCSS Wind Zone II Corner/Non-Corner Corner Design Pressure 48 psf Deflection Limit L/180 Clear Height, h 96 in. Specimen Width, w 49.5 in. Material: Polyethylene Sheeting Uniform Load Application Thickness: 6 mil Location: Between exterior sheathing and exterior siding 2. TEST PROGRAM 2.1. DEVIATIONS FROM TEST STANDARD The testing detailed herein was performed with no modifications to the test standard(s) DESCRIPTION OF TEST SPECIMENS Three similar test assemblies were constructed from the sample siding material provided by the client. Panels Décor Stone siding is made from a two component polyurethane rigid foam system. A diagram of the test assembly is provided in Figure 1, and a detail of a siding panel is provided in Figure 2 in the Appendix. Additional photographs of materials (Figures 3 and 4), construction (Figures 5 through 9), and testing (Figures 10 through 12) are also provided in the appendix. It must be noted that NTA did not oversee or verify the sampling procedure used by the client when selecting the sample material(s). As necessary, NTA, Inc. provided commonly available construction materials and assembled each specimen to the client s specifications. AFMCO Page 2 of 18

3 Location Studs Top Plate Bottom Plate Interior Sheathing Exterior Sheathing Exterior Siding Table 2: Materials Material Single 2x4 Stud Grade SPF at 16 in. oc Single 1x4 Un-Graded SPF Single 1x4 Un-Graded SPF 5/16-in. x 48-in. x 96-in. Square Edge American Gypsum (Applied Vertically) 48-in. x 96-in. x 3/8-in. OSB, Rated 24/0, Exposure 1 (Applied Vertically) 24-in. x 48-in. x 3/4-in. Panels Décor Stone Siding (No ship lap joints, and measured thicknesses varied from ¼-in. to 1-in.) Composed of a two-component (Dow Voracor CS 1585 and Voracor CE 151) rigid foam system (See Figures 2 through 4) Table 3: Fastening Schedule Connection Fastener Quantity or Spacing Top Plate-to-Studs 7/16-in. x 1-3/4-in. x 15 Ga. Staple 3 Bottom Plate-to-Studs 7/16-in. x 1-3/4-in. x 15 Ga. Staple 3 Exterior Sheathing 7/16-in. x 1-1/2-in. x 16 Ga. Staple 6/6 a Exterior Siding-to- Sheathing (Mechanical) #9-11 x 2-1/2-in. Premium All-Purpose Deck Screw with Type 17 point Fastenal # Interior Sheathing 3/16-in. x 3/4-in. x 19 Ga. Staple (mechanical) Pemco 3100 by Alpha Adhesives Interior Sheathing (adhesive) Note: 7-day cure time allowed prior to testing. a Given as edge spacing/field spacing 4-in. oc horizontally, (3) rows along each siding panel, (1) row 1 in. from the top stone edge, (1) row 1 in. from the bottom stone edge, and (1) row at the panel center; at least (2) fasteners from each row hit a stud (1 in. edge distances) 6/0 a (1) 3/8-in. diameter bead per framing member 2.3. TEST PROCEDURE The test procedure is based on ASTM E72 2, Section 11; however, the loading stages were modified to correspond with those required in the ultimate load test procedures found in Section (b) of the Federal Manufactured Home Construction and Safety Standards. Accordingly, the test setup consists of a vacuum chamber with an open side slightly larger than the test assembly, as shown in Figure 3. A vacuum pump and manometer connection provide a means to apply and monitor the applied pressure. The samples are placed with the exterior sheathing facing inward, thereby placing a negative AFMCO Page 3 of 18

4 force on the exterior sheathing. The polyethylene sheeting is pleated to accommodate the specimen deflection and then sealed to the chamber. Instrumentation consists of a water manometer and dial indicators. The water manometer has a resolution of 0.1 inches of water for pressures up to ±72.0 inches of water. Dial indicators, with a resolution of in., are positioned along selected studs to take deflection readings at mid-span and at the supports. For specimens with studs spaced at 16 in. centers, the center two studs are gauged, using a total of six dial gauges. For studs spaced at 24 in. centers, only the middle stud is gauged, using a total of three gauges. For testing, each specimen is loaded monotonically at approximate ¼ live load pressure increments. Upon reaching each loading stage, applied load is maintained for not less than 10 minutes prior to reading the dial indicators. Once the dial indicators have been read, the pressure is increased to the next loading stage. This procedure is followed through pressure corresponding to 1.25 times live load. After which, the dial gauges are removed and the pressure is increased to ultimate load. At ultimate load, the peak pressure and mode of failure are noted. Ultimate load is taken as the point where the specimen exhibits rupture, fracture, or excessive yielding. Any failure or observations at any point during the test are duly noted. The applied pressure, in inches of water, is converted to pounds per square foot (psf) using the following conversion: 1 inch of water column = 5.2 psf. 3. TEST RESULTS A total of three specimens were tested using the procedure outlined herein. The ultimate loads and service load deflections for each specimen are presented in Table 4, below. This table also provides average values, which are compared to the required pass/fail criteria. Specimen Ultimate Pressure (psf) Service Load Deflection (in.) Table 4: Test Results Failure Mode at Ultimate Fastener head pull-through of the siding at the top of the specimen. Flexural failure of outside stud near mid-span at a knot then transferring to fastener withdrawal of the bottom plate to stud connection. Fastener head pull-through of the siding at the top of the specimen. Average Evaluation Criteria a Overall Pass Pass -- Result a As required by the FMHCSS 1, which requires a factor of safety of 2.5 against failure and L/180 deflection limit under service level loads. AFMCO Page 4 of 18

5 4. CONCLUSION Three similar assemblies were tested and assessed in accordance with the ultimate load test procedures of the FMHCSS. The conditions of test and overall findings are summarized in Table 5, below. It must be noted that the data provided herein applies only to the samples tested and may not be extrapolated beyond these samples to a larger population. The data provided herein were obtained and assessed in accordance with FMHCSS test procedures and criteria and should not be used for other types of construction. For use in manufactured housing, these findings and results are subject to DAPIA review and approval. Specimen Table 5: Conclusion Test Conditions Overall Result Single 2x4 Stud Grade SPF on 16 in. centers with 5/16-in. Gypsum interior sheathing, 3/8-in. OSB exterior sheathing, and ¾-in. Panels Décor Stone siding for 96 in. tall exterior walls fastened and constructed as detailed herein. Wind Zone II Corner PASS PREPARED BY: Brad Wear Project Engineer REVIEWED BY: Douglas Berger, P.E. Program Engineer AFMCO Page 5 of 18

6 REFERENCES 1. Department of Housing and Urban Development (HUD). Manufactured Home Construction and Safety Standards & Interpretive Bulletins to the Standards. 24 Code of Federal Regulations Part Office of Assistant Secretary for Housing, Federal Housing Commissioner, Department of Housing and Urban Development. 2. American Society for Testing and Materials (ASTM). Standard Test Methods of Conducting Strength Tests of Panels for Building Construction. ASTM E ASTM International, West Conshohocken, PA, pp. AFMCO Page 6 of 18

7 FIGURES Figure 1: Specimen Diagram AFMCO Page 7 of 18

8 FIGURES Figure 2: Siding Panel Detail (Note: Panels Tested had Local Thickness Variations from ¼-in. to 1-in.) AFMCO Page 8 of 18

9 FIGURES Figure 3: Siding Received (Front Side) AFMCO Page 9 of 18

10 FIGURES Figure 4: Siding Received (Back Side) Figure 5: Framing Constructed with OSB Attached AFMCO Page 10 of 18

11 FIGURES Figure 6: Adding Adhesive for Gypsum Figure 7: Gypsum Attachment AFMCO Page 11 of 18

12 FIGURES Figure 8: Siding Attachment Figure 9: Siding Attachment Detail Views AFMCO Page 12 of 18

13 FIGURES Figure 10: Test Setup Figure 11: Specimen #57658 after Ultimate AFMCO Page 13 of 18

14 FIGURES Figure 12: Fastener Head Pull-Through of Specimen #57658 AFMCO Page 14 of 18

15 APPENDIX AFMCO Page 15 of 18

16 APPENDIX AFMCO Page 16 of 18

17 APPENDIX AFMCO Page 17 of 18

18 APPENDIX AFMCO Page 18 of 18