The Clincher

How do you make Hawaii's single wall homes safer and stronger to resist hurricane force winds and seismic forces from earthquakes?

clincher   clincher
Figure A: The unique patented radius that allows this clip to be installed on Hawaii's plantation style homes, where the blocking extends out from the wall.   Figure B: How they look after they are painted on an existing building with the freze board extending out from the wall.

The clincher was designed to work on Hawaii's old plantation style homes with heavy 4"x6" rafters with a 4’ overhang and rafters 4’ apart and only held down by four nails. It doesn't take much wind pressure to easily exceed the hold down capacity of these nails as they are driven from the side of the rafter into the wall top plate at an angle, so are only held by friction.

To exacerbate the problem even if the nails held, only a small portion of the wood is being held down, and is relatively easy to break off.

The clincher increases pull out strength from 300 lbs. to over 3,000 lbs. per rafter: a 10 times increase and with the price of the hardware being between $300 and $400 dollars. Is the best investment you will make on your home and pays for itself year after year and not just at resale time.

Figure 1: Hawaii plantation style home with heavy 4 x 6”rafters and how they are thicker than three 2x4” rafters Figure 2: toenail connection is driven at an angle and h as the same amount of mails as a 2x4” toenail connection Figure 3: left and right hand clincher, mounted on a 2 x 4.double plate without blocking

Another advantage is that an insurance adjuster can readily verify that hurricane clips are installed on the building so you can receive an insurance discount of 10 to 15% per year.

But the biggest advantage is that you will have made your house safer and stronger for your family and made a huge difference on solving our landfill problem since yours won’t be in it...

So the clincher is much more than just a 14 gauge galvanized steel metal connector with a patented unique configuration that allows homeowners or carpenter an easy and efficient way of tremendously increasing the strength of older homes.

Metal connectors have proven their worth and are required by modern building: codes because they work. They do this by using 10 nails per clip instead of three or four nails total per rafter. On heavy 4" x 6" rafters that are typical Hawaii plantation style homes and single wall construction the clincher enables you to install an additional 10 nails per side that are in sheer for a total of 20 additional nails that raise the uplift capacity from 300 to 400 pounds to almost 3000 pounds per rafter.

Figure 5: Test rig using a Dillon dynometer to verify and confirm what the testing labs have proven

Figure 5 shows a test rig using a Dillon dynometer to verify and confirm what the testing labs have proven. But mainly to see how we toenail connections are and in the methods in which they usually fail.

What made the clincher so unique was at the time the only way to retrofit your Hawaii plantation style home was you had to either disassemble the frieze board or to build up underneath it by using additional lumber.

The clincher was designed to overcome this problem by having a patented radius. That allowed a handy homeowner a way of increasing the strength of their homes by an additional 3,000 pounds of uplift capacity for each rafter.

They are made of 14 gauge galvanized steel and have a strengthening gusset at the 90° angle and work on most Hawaii homes.

They can be ordered in pairs or separately, when facing the wall on a 2" x 4" rafter. If you prefer, which side right or left, that is what you should order.

On heavier rafters I would recommend a clincher on either side. Usually a right handed carpenter has an easier time installing the right hand ones.