Brian Harris Homes - block foundations

From time to time we have questions about using Cable-tite as hurricane and high wind tie-down protection with block foundations. There is a little more work to anchor the top plate to the foundation anchor bolts, but it can be done.

I recently worked with Matt Harris at Brian Harris Homes, a new home builder in middle Tennessee. One thing I liked that Harris did was core fill the block to the footer. This offers much better hold down value than blocks with only the top block filled.

After the house was framed and roofed, I went to the crawl space and installed the anchor nut and cap. I drilled a 3/8 hole for the cable, then attached it to the top plate as standard installation. I crawled back under the house and locked the Cable-tite firmly in place.

NOTE: See the small blue electrical wire sticking through the floor above the drill in the photo above? I drilled a small 1/8" hole in the subfloor and used the blue wire to mark my place. Upstairs, I drilled the 3/8" hole for the cable. This is much easier when working in a small crawl space.

In this photo of the finished installation, note that the anchor nut, cap and cable vise are not seen. They are in the crawl space below.

WKRN Channel 2 News story

http://www.wkrn.com/global/story.asp?s=12223631#

(video on website)

GALLATIN, Tenn. - A Gallatin company has designed a system that may keep homes in one piece during high winds.
Cable-Tite installs high tension cables within the walls of new construction homes. The cables are anchored in the foundation and tied to the roof.
"What we're trying to do is hold the roof to the foundation," Cable-Tite's Dale Richardson explained. "We want to keep the square of the top plate and the bottom plate and the walls as a cube and hold it together."
The science behind Cable-Tite is that if the home is kept squared, with the roof intact, the construction can withstand higher sustained winds and wind gusts.
Richardson said, "When you have high winds, it's trying to push the roof off the top of the house and when the roof goes up, then the walls fall over."
Cable-Tite has only been in business for two years and has done most of its work so far along the Gulf Coast and in Houston, Texas.
As for costs, according to Richardson, in "most houses, it's going to be maybe 1% of the total cost, if you're talking a $200,000 home, maybe $1,200 to $1,500."
Gallatin builder Fred Yates told News 2 he wouldn't think of building another house without Cable-Tite.
He's currently including the system in a massive upper-scale home on Old Hickory Lake.
"Anytime [the wind] starts whipping up, you can see it can get under that roof and lift it up," he said. "If you don't have something holding it down, it can tear it right off."
Yates said he can see the system gaining popularity quickly among other builders who build upscale homes, and once others see the benefit, the cable system will be in demand in mid-priced houses.
"This system will probably not withstand a Category 5 [Hurricane], but nothing will, but the peripheral winds, the ones that are 60, 70, 90 miles per hour, you don't have a problem," he said. "It'll hold it down.
Richardson said the system has been lab tested to withstand winds of up to 90 miles per hour, but so far, none of the homes where the system has been installed have been tested by Mother Nature's highest winds.

IAPMO Evaluation Report - News Release

IAPMO ISSUES FAVORABLE CABLE-TITE REPORT

Gallatin, TN – On March 1, 2010 the IAPMO Certification Board issued an Evaluation Report which certifies that Cable-Tite meets the International Building Code for residential wood-frame construction in high-wind regions. IAPMO reviewed the certified Smith-Emery Laboratories test results with their engineering staff and determined that Cable-Tite’s claim as a hurricane hold-down system was true. The report, number 0170, is available to read online at www.cabletite.com.

New home builders continue to search for the most robust system for protection from uplift caused by high winds. There is a good, better, and best approach for what they choose. The metal hurricane clips are a good system that allows for minimum protection. The threaded rods offer better protection but are difficult to install. The best system is the “Cable-Tite” system that uses cables to create a continuous path from the roof to the foundation.

“Other current methods are time consuming and expensive. Cable-Tite is an easy system to install, in about half the time, and offers better protection”, says Dale Richardson, Business Development Director at Cable-Tite. “The high-strength steel cable is attached to the top plate and held securely in place with our patented cam locking cap and nut screwed to the concrete embedded anchor bolt.”

With the recent certification, engineers, builders, codes inspectors, and ultimately, home owners can request and use Cable-Tite Tie-Down Systems with confidence.