Author |
Message |
David Axt, AIA, CCS, CSI Senior Member Username: david_axt
Post Number: 753 Registered: 03-2002
| Posted on Tuesday, November 07, 2006 - 01:01 pm: | |
Currently we are having problems on a job where the framing is telegraphing through the HardiePlank. Because HardiPlank is flimsy it is showing all the imperfections in the wall. Has anyone else experienced this problem? |
Jerome J. Lazar, RA, CCS, CSI, SCIP Senior Member Username: lazarcitec
Post Number: 273 Registered: 05-2003
| Posted on Tuesday, November 07, 2006 - 01:26 pm: | |
David Are you not applying the Hardiplank over sheathing product - why would there be a telegraphing problem if the sheathing is installed correctly? |
Ralph Liebing, RA, CSI Senior Member Username: rliebing
Post Number: 490 Registered: 02-2003
| Posted on Tuesday, November 07, 2006 - 01:43 pm: | |
Check the evaluation report-- NER-504. There is a host of information in that. Just a thought and the report may speak to it-- is the framing spaced in accordance with the requirements of the siding? If it is spaced too widely, the siding will "sag/deflect" between studs. |
Wayne Yancey Senior Member Username: wyancey
Post Number: 215 Registered: 05-2005
| Posted on Tuesday, November 07, 2006 - 02:37 pm: | |
David, James Hardie's Best Practice Guide for installation of their products warns. "Hardiplank lap siding cad be installed over braced wood or steel studs spaced maximum 24" o.c. or directly to minimum 7/16" OSB sheathing..." "Iregularities in framing , sheating, and foam insulation can mirror through the finished application." "Irregularities should be addressed and corrected before the siding is installed." All that said, I have not witnessed this phemomena with fiber-cement lap or panel siding over a sheathed wall (OSB, plywood, or other). I have fiber-cement lap siding (of all colors) on projects all over Seattle and the eastside areas. No worries. Wayne |
Anne Whitacre, FCSI CCS Senior Member Username: awhitacre
Post Number: 409 Registered: 07-2002
| Posted on Tuesday, November 07, 2006 - 08:22 pm: | |
David: there is a thread on 4specs that dates back to 2001 where you're having problems with Hardie board (see way.... down the bottom of this discussion thread at "Fiber cement siding" about 3 from the bottom). maybe your firm just needs to find a different product..... Anne |
David Axt, AIA, CCS, CSI Senior Member Username: david_axt
Post Number: 754 Registered: 03-2002
| Posted on Wednesday, November 08, 2006 - 03:56 pm: | |
Anne, On the previous thread, I was not having problems with HardiePlank siding, I was just asking for equivalent products. It is basically illegal to write a proprietary spec for public work, baring some extenuating circumstances. I needed to find some competing products to James Hardie. The silicosis warning discussed in the thread is placed on anything that contains sand. You will see this warning on everything from fireproofing to premixed mortar bags. When I was the sole specifier at Zimmer Gunsul Frasca Seattle office, I specified HardiePlank for the Green Hill School project and a building at Washington State University. The Green Hill School project is a juvenile detention facility. We originally had brick on the building but it was value engineered out. I figure that if the siding is good enough for a juvenile detention facility it is good enough for a public school. Some would argue that they are one in the same. I am now convinced that that the problem is the wall assembly not the product. Against my advice, the architect did not use wall sheathing. Instead he detailed 1 inch of polyisocyanurate insulation as a thermal break over the metal studs. The insulation is crushing when the contractor drives the screws through the siding and into the metal framing. We have not had the waviness problems with the siding when we used DensGlass Gold (or equivalents) wall sheathing. |
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