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Brand | Grabber | Backer-On | Pro-Twist | Pro-Twist |
Name | #8 x 1-1/4 in. Flat Washer Head Phillip Cement Board Screw (50-Pack) | #9 x 1-1/4 in. Serrated Flat Head Star Drive Cement Board Screws (185-Pack) | #8 x 1-1/4 in Phillips Flat-Head Fiber Cement Board Screw (1 lb. Pack) | #8 x 2-1/4 in Phillips Flat-Head Fiber Cement Board Screw (1 lb. Pack) |
Price | $598 | $886 | $1297 | $1297 |
Ratings | (4) | (266) | (11) | (6) |
Screw Length | 1-1/4 in | 1-1/4 in | 1-1/4 in | 2-1/4 in |
Size | #8 | #9 | #8 | #8 |
Drive Style | Phillips | Star | Phillips | Phillips |
Head Style | Washer Head | Flat Head | Flat Head | Flat Head |
Fastener/Connector Material | Steel | Steel | Steel | Steel |
Features | Coated | Coated,Self Drilling,Self Tapping | Coated,Self Drilling | Self Drilling |
View Product | View Product | View Product | View Product |
![]() | ![]() | ![]() | ![]() | |
Brand | Grabber | Backer-On | Pro-Twist | Pro-Twist |
Name | #8 x 1-1/4 in. Flat Washer Head Phillip Cement Board Screw (50-Pack) | #9 x 1-1/4 in. Serrated Flat Head Star Drive Cement Board Screws (185-Pack) | #8 x 1-1/4 in Phillips Flat-Head Fiber Cement Board Screw (1 lb. Pack) | #8 x 2-1/4 in Phillips Flat-Head Fiber Cement Board Screw (1 lb. Pack) |
Price | $598 | $886 | $1297 | $1297 |
Ratings | (4) | (266) | (11) | (6) |
Screw Length | ||||
Size | ||||
Drive Style | ||||
Head Style | ||||
Fastener/Connector Material | ||||
Features | ||||
View Product | View Product | View Product | View Product |
Lisa, I assume you are using the correct driver which came in the box of screws. Some of the screws use a Phillips head and some use a star shapes head. The bit that came with the screws is the one you need to use. I have used these screws and the cement board about a gazillion times and never had the problem you discribe. If you are using the correct driver but and you can't get the screw started, try drilling a hole smaller than the screw diameter. Set your drive on low speed and firmly press down on the screw head pushing straight down. The cement board Hardie Board, is actually rather soft and drills rather easily. Once you get the hang of drilling a pilot hole for the first couple of screws you will get the hang of it and not need to drill a hole first. Good luck
28 screws are NOT enough. I believe there are 56 dimples on each full board. Don't scrimp. At 5 cents a screw, you are only saving $1.40 a sheet.
Depends on how many you use per sheet I like to use one every 6 inches vertically and horizontally 77 screws per sheet so almost 10 sheets
The screws are a full 1.25". The standard half inch Backerboard is actually just 0.42" so you're going to be 0.12" too long which is more like 1/8".
YEs, that's what they are for.
I'm not sure if these would work perfectly because I have utilized them this way, however if you pre-drill I think they should work. If that don't work for you get a flat head steal screw and drill I pilot hole in the backer board and then attach to aluminum.
No we used on wood
These would be strong enough but I am not sure if the length would be sufficient for a toilet flange. It depends on your subfloor as well.