Estimating lumber needs?

Is there a general rule of thumb to calculate lumber needs for a project? For example if door rail and stiles calculate to 28 ft2, can one typical add say 10% to cover cutoff, short sizes and waste.? I did not include screwups as for me Id need to buy 2x. thanks for the tips
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trs80 wrote:

with your cut list in mind some defect might be ok. If you get a bunch of board with defects in bad places you may have more waste. If you get 28 board feet of lumber but all the wood is 5.5" wide when you need stuff at 3.5" then you have a fair bit of waste.
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"trs80" wrote in message

Really depends upon whether you do your own milling or not (buy rough lumber, SxS, etc instead of dimensioned).
That said, 20% waste is not an unrealistic average for most projects regardless of how you buy your wood. What will really help keep the number down, besides a good, workable, well thought out plan, is a cutlist program like CutList Plus:
http://cutlistplus.com /
It also has some benefit in optimizing your cuts to keep waste down, although this works better with sheet goods than it does with hardwood lumber if you don't have much experience selecting stock ... what can really eat up hardwood inventory is the necessity to do glue-ups and grain matching.
--
www.e-woodshop.net
Last update: 1/27/07
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For my own projects I don't need to figure too much more than 10% since I'll pick what I need. On the job however it's a different story. We always add about 20% for hardwood stock and depending on where it comes from we might add as much as 50%. One time I had a builder bitch at me about ordering too much stock. He gets credited back from the supplier but his first trim invoice was getting up there. We were about finished with the job and I asked him to go into the garage and see if there was any stock left out there that he thought we could use. There wasn't. The next house we were ordering stock from the millwork. I was happier than he was!
Mike O.
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You might want to invest in an inexpensive optimization program like Cut List Plus to help you determine the best sized boards to buy to get the most yield from a board. It will also tell you how much wood to buy.
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I use a 20% scrap figure for pricing. That is figured if you can pull your stock from a large quantity and get good cuts. If you are buying just enough boards I would always buy 50% extra and assume you'll have about 20% left over or 30% scrap.
If you are using a figured wood and want to select faces then assume 50% scrap or if you are using cherry or other materials with white wood and you want to use all heart.
BW

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This supplier seems to think 35% is prudent. JG
http://www.forloversofwood.com/canada/woodFrame.html
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trs80 wrote:

As a hobbyist I have two different methods for waste calculations. If the lumber purchase is coming out of my pocket money I'll figure in about 10%. If the lumber purchase is coming out of the general house funds I'll try to get away with as much allowance as possible. I usually start out at about 100% overage and working my way down from there as needed.
--
Jack Novak
Buffalo, NY - USA
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its all my money. I dont need to beg for it.

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