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Question DetailsAsked on 3/23/2018

Cut out damaged deck board without damaging one on either side

Not a ledger board. A deck board in the middle of the deck has dry rot. I want to cut out a section and replace without damaging neighboring deck boards. What kind of saw would do that?

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3 Answers


What about using one of those Multi-tools with the oscilating blade, can cut a straight line using a ledger, can cut right up to the boards on either side?

Answered 2 years ago by TomWalker


Good point by TomWalker - I had never tried cutting 5/4 or 2x material with an oscillating tool - normally only use it for undercutting 1/2 or 3/4" thick door frames and stop trips to provide flooring clearance and the occasional piece of flooring and such, so I went out in the garage and tried it on a scrap of 5/4 hardwood and a piece of 2x6 hem fir decking.

Hardwood was basically a complete no-go, and the 2x not so successful either, at least not with mine, which is an industrial Black & Decker one. Just too thick to get a decently square cutoff, and VERY slow, though for presumably only a couple of cuts for one rotted deck board the time would not be a big issue - certainly worth a try if the OP happens to have one in his toolbox.

But a real good idea for the final cutoff of the remaining wedge of uncut wood at the end of cut if the bulk of the cut was done with a circular saw or such.

Answered 2 years ago by LCD


Sorry - when I responded back the second time, I failed to notice you were the original poster. One thing came to mind - since any useful cut has to be over a joist (can't leave a free cut end mid-span) of course if using an oscillatory multipurpose tool, you would almost certainly have to get the nails/screws out first, which might inhibit things. Just don't overheat your tool - mine got pretty hot and need a few rests to cut even half way through a piece of 2x6. If the housing is getting too hot to hold onto indefinitely it is absolutely hotter than it should be - those tools are not relly made for that heavy duty of a cutting job if trying to do the entire cut with it.

Normally knocking the board loose from underneath the deck and then cutting to suit to salvage any usable length is by far the easiest.

Answered 2 years ago by LCD

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