replying to BobK207, Iggy wrote: OH YEAH, you got it PERFECTLY RIGHT BobK207!!! "Racking Resistance" is just another absolute fraud of the Horizontal Installer's LIES. It's even part of (#11) my list below, since they always mention that nonsense. Here's what's wrong with Horizontal and why it'll never be right:
1 ? DEFECTIVE SEAM - Horizontal rows needing more than one drywall panel CREATES (instead of AVOIDS) a butt-joint HUMP, which are NOT flat and are a TWICE (minimum) effort DEFECT. Outlet and switch cover-plates, window and door trim, baseboards, pictures, mirrors and cabinets don?t sit flat. Using ANY "butt-joint product" erases ALL "claimed benefits" of Horizontal! 2 ? UNSUPPORTED SEAM ? Horizontal?s tapered edge is MOSTLY unsupported, only 10% (instead of Vertical's 100%) contacts framing, the seam WILL AND DOES crack. Light switch and countertop electrical boxes within the seam equals MORE weakness and butt-joint doubled, MINIMUM, efforts. 3 ? STRUCTURAL DEFECT - Horizontal only reinforces a wall height of 4? or less and the wall's top-plate is never connected to the bottom-plate. As in and due to #2 above, Frictional Contact is MINIMIZED (instead of maximized by Vertical). 4 ? SEAM DECEPTION...(4'x8' PANELS) ? Example 1: 48? tall by 102? long wall, Horizontal = 48? (technically) and it?s a 24? wide butt-joint (Vertical = the same, generously, 96? but they?re easy 6? wide joints). Example 2: 96? tall by 102? long wall, Horizontal = 222? with 50% being 24? wide butts (Vertical = 192? of 6? wide easy joints, yes LESS)...in a Kitchen Horizontal = 100% of 24? wide butts (Vertical = 0%). Yes, Horizontal does the taper area twice (minimum) in order to hide its butts, so very minimally just another 24? was added and #5 below was not factored in to Horizontal's monumental FRAUD. 5 ? SELF-DEFEATING ANGLES ? Horizontal only uses ONE of a panel?s tapered edges and PUTS the other taper at the ceiling corner and baseboard, CREATING (instead of AVOIDING) a twisted angle that MUST be shimmed or ADDITIONALLY mudded. This too, instantly ERASES ALL claimed benefits of Horizontal! The Panels are designed to be installed Vertically! 6 ? UNFRIENDLY SEAMS ? Horizontal celebrates the chest height seam and PRETENDS there?s no 24?-WIDE floor to ceiling butt-joint that needs to be DONE AND DRY BEFORE doing the ceiling corner (Vertical has easy joints and the top's done later with the ceiling corner). 7 - FIRE VIOLATION AND HAZARD - Horizontal only fills the coin-thin SEAM'S FACE and has NO back-blocking, inviting smoke and fire?s spread, including fuel-air for a fire's growth (Vertical is full depth and CONTINUOUSLY airtight). 8 - UNSAFE INSTALLATION - Horizontal needs 2-PEOPLE for a safe installation and the panel is airborne, literally CREATING the chance to CAUSE injury (Vertical easily tilts-up with just 1-person). Panel lifters aren't even as easy and safe as Vertical?s tilt-up. 9 - ADDITIONAL WASTE - When correctly covering a knee or half wall, tub front, column or soffit by first removing both tapered edges, Horizontal CAN'T use the tapers elsewhere (Vertical can and does). 10 - SELFISH IGNORANCE - Foundation and Framing crews go to great pains to make everything flat, level, plumb and square. Horizontal DESTROYS those efforts with their DEFECTIVE humps (Vertical keeps them all). 11 - GRASPING AT STRAWS WITH OUTRIGHT FRAUD - Horizontals FALSELY AND UNKNOWINGLY wave the absurdly INVALID (FPL439) 1983 testing ?Contribution of Gypsum Wallboard to Racking Resistance of Light-Frame Walls? by the self-indicted fraud Ronald W. Wolfe. FPL439 found that ALL tapered or paper wrapped edges must be FULLY INTACT for Horizontal to beat Vertical "structurally", PERIOD. In the real-world, bottom paper wrapped edges are REMOVED (at a minimum), BY LAW, for spacing from all floors and thereby COMPLETELY NEGATE Wolfe?s inexcusably deceitful and worthless "study" and summation. 12 - JOINT OR SEAM TREATMENT - According to the ASTM's C840, Horizontal's joints and seams MUST be mudded to provide ANY fire, smoke and air travel resistance. Vertical is SO GOOD that it's NOT REQUIRED to have its joints or seams treated. 13 - FIRE RATING FRAUD - Most Single-ply or layer drywalling for Commercial Work is required to be installed Vertically, to obtain drywall's actual fire rating...known by the majority of builders and drywall installers. But, they only provide Builder's Grade work, the legal minimum with the look expected by the market. Good for the warranty term with an eternal future of patching and fixing.Only promote HORIZONTAL AS WRONG and confidently cite the above incontestable FACTS.