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#1
07-17-2006, 06:04 AM
 Glenda Guest Posts: n/a
Square Feet to Linear feet

Hi, I'm new to this forum as well as the industry I am now working. I've been getting pricing for construction materials for a new home being built and have sent off material lists for quotes to several building supply houses. I have sent off the quantities needed for lumber 1" x 6" T& G in Sq. Feet units and receive back Board Feet Units or Linear Feet units. I would like to be able to convert all the quotes to linear Feet so I can compare pricing accurately. The problem I face is that everyone seems to have varied calculators for this conversion I guess this may be due to what each particular company factors in as a waste factor. What I don't understand is if I am asking for the same grade lumber how can the calculation vary so much?
To confuse the matter I asked for 5/4 x 6 TG @1079 Sq ft and instead of linear or Bd Ft I got back a board price @ \$11.99 for a 16' Bd. Please help!

Last edited by Glenda; 07-17-2006 at 01:22 PM.
#2
07-17-2006, 07:09 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,467 Rep Power: 13
Re: Square Feet to Linear feet

Linear feet takes only the length of the board into account.

Square feet would take the length in feet times the width in feet.

Board feet is the length of a board that is 12 inches wide by 1 inch thick.

To convert square feet to linear feet:
square feet / width of board in feet = linear feet

To convert board feet to linear feet:
board feet / width of board in feet / thickness of board in inches = linear feet
#3
07-18-2006, 07:51 AM
 Glenda Guest Posts: n/a
Re: Square Feet to Linear feet

Quote:
 Linear feet takes only the length of the board into account. Square feet would take the length in feet times the width in feet. Board feet is the length of a board that is 12 inches wide by 1 inch thick. To convert square feet to linear feet: square feet / width of board in feet = linear feet To convert board feet to linear feet: board feet / width of board in feet / thickness of board in inches = linear feet

I belieive I understand all that, so a 5/4" x 6" x 16' Board would equal 10 Board Feet?
(1.25 x 6) = 7.5 x 16= 10. For 1079 Sq Ft. The Lumber Yard Estimated 148 Boards = 1480 Bd Ft
So If I am following you, to calculate linear ft from board ft
10( Bd Ft) divided by .5 ( Width of Bd) Divided by 1.25( Thk of Bd in Inches)= 16 Linear Ft
So 1480 Bd ft = 2368 Ln ft

Convert Square Ft to Linear Ft
1079 Sq Ft / .5 (Width of Bd in Ft)=2158 Ln Ft.

Is the difference a waste factor or to account for actual Board measurement?
#4
07-18-2006, 11:06 AM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,467 Rep Power: 13
Re: Square Feet to Linear feet

From what I understand, lumber is not exactly what it says it is. For example, a 2x4 is not 2" by 4". So possibly the boards are not exactly 6" wide.
#5
08-30-2006, 03:31 PM
 George Guest Posts: n/a
Re: Square Feet to Linear feet

I have a wall, 12' wide x 7' tall. I want to put 1 x 8 cedar boards horizontally. How many linear feet is this, and how many boards would I need?
#6
08-31-2006, 07:44 AM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,467 Rep Power: 13
Re: Square Feet to Linear feet

Are 1 x 8 boards 8 inches wide? Or is 8 something to do with the length?

7 feet / (8 / 12) feet = 10.5 boards

10.5 * 12 feet = 126 linear feet

Thats assuming each board is 8 inches wide.
#7
12-26-2007, 05:06 PM
 wizzard308 Guest Posts: n/a
Re: Square Feet to Linear feet

since this is on the subject of linear feet I will post this here.
I have a dealer who has priced logs to me for a cabin at 0.70 per LF
which sounds wrong to me. He then stated that in my 70 X 45 log home shell I will have around 13,000 dollars tied up in it. But if he is using LF this price does not come out right.

@0.70 cents per LF and the logs being 8" high and 7' Thick
We are figuring 15 runs high so that would be
70 X 2 and 45 X 2 which is 230 LF (if im right)
230 X 15 runs high is 3450 LF so it would be more in the range of \$2415 if he was right. Im lost on the whole matter

he used some big long drawn out conversion of L x W bull divided by something else. I think he is working syaing its LF when it is actually BF

can anyone tell me, using 8 X 7 inch logs
house dimensions are 70 ft X 45 ft
how many BF will I have here?
(edited, question BF not LF)

Last edited by wizzard308; 12-27-2007 at 01:58 PM.
#8
12-27-2007, 04:41 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,538 Rep Power: 19
Re: Square Feet to Linear feet

Your calculation seems correct for the walls, assuming 15 logs high.

The area LxW would only be relevant to the roof, whatever it is made of. Given that the roof has a slope and overhangs somewhat, it would larger than the floor area
#9
12-27-2007, 01:56 PM
 wizzard308 Guest Posts: n/a
Re: Square Feet to Linear feet

Ok so it would be safe to assume he was talking in BF not LF
He quoted me around 13K for the shell so with that being said its pretty obvious he is saying LF when he actually means BF

0.70 cents per LF is somewhat cheap for cut logs I would think.
#10
12-27-2007, 02:24 PM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,538 Rep Power: 19
Re: Square Feet to Linear feet

I assume the logs are still somewhat rounded, so I am not sure exactly how a board foot would be defined.

If I just take the overall dimensions, 8" x 7", the cross-section area is 56 in^2 vs 12 in^2 in the definition of a BF. So the logs would be 4.667 BF/LF, or about \$11,300.

Any rounding would reduce the actual cross-section, but who knows how they price.

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