Deck/Patio railing - cutting posts and attaching a rail cap

wkrickMay 25, 2012

I'm preparing to build a railing across the back of a terraced patio area in my yard to prevent people from accidentally stepping off the back edge. It's a 3 foot drop so a railing is necessary.

I'm building the railing using 4x4 posts with 2x4 top and bottom rails with round aluminum balusters in between. All wood is pressure treated.


1) My posts will be flush with the top of the rail, and then I'll be adding a 2x6 cap. What is the best way to attach this cap? My first thought was to use #8 2 1/2 inch stainless screws from the top side. I've seen people suggest that drilling down through the top will allow water to seep in and cause the wood to decay faster. So then I started thinking about possibly attaching it from the underside instead, but I'm not crazy about toe-"nailing" with screws because I fear splitting the 2x4s and/or having the screw points poke out through the top. I also don't have a countersink bit, though I could pick one up. When screwing from below, 2 1/2 inch screws are probably too long, so I assume I'd need something shorter.

2) I was planning on cutting all my posts to final size before installation, but I saw someone online suggest that you should leave the posts longer than needed and cut them after installation by snapping a chalk line with a level. How do people normally do this?

Thank you for reporting this comment. Undo

I screwed from the top and then plugged the holes.

    Bookmark   May 28, 2012 at 7:20PM
Thank you for reporting this comment. Undo

What did you use for plugs?

    Bookmark   June 4, 2012 at 3:59PM
Thank you for reporting this comment. Undo

I used a drill press to cut plugs from scraps of the wood (garapa in my case).

    Bookmark   June 5, 2012 at 7:55PM
Sign Up to comment
More Discussions
Bad Caulk Job- Need Advise
We had some structural work done to our front patio....
Vanessa Abbey
My aging parents need new front and back steps leading...
Gemini Restore-A-Deck vs Woodrich Cleaner/Brightener
It's been awhile for me on this forum but I remember...
Would love your input for stair/deck remodel on midcentury home!
As you can see, we inherited an interesting staircase...
2nd floor covered porch questions.
1) What is the proper technique and layers for a porch...
Molly Dunning
Sponsored Products
Egyptian European Hand-woven Premier Large 24 x 40 Bath Rug
Outdoor Weathered Bronze 4-bulb Froggie Post
Eurofase Posts Glenhaven Collection Antique Iron Outdoor Post Light 17519-014
Home Depot
Hampton Bay Posts 3-Head Outdoor Post Light HB7017P-06
Home Depot
Weathered Bronze Solar LED Royal Post Mount
$119.99 | zulily
3-Light Post Lantern Antique Brushed Nickel
1.5-Qt. Mixing Bowl
$7.99 | zulily
Energy Saving 1-light Outdoor Post Head
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™