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12-07-2006, 07:01 PM
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#1
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Don
Trade:
Paint Contractor
Join Date: Dec 2004
Location: Winston Salem NC
Posts: 676
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Questioning sq ft formulas
Just to clear my head I want you guys to do me a favor and answer the following:
I have a room 27x28x8. If one gallon of paint will cover 300 sq ft, how many gallons do I need?
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12-07-2006, 07:15 PM
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#2
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Pro
Trade:
Painter
Join Date: Sep 2006
Location: Las Vegas NV
Posts: 845
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About 3 per coat.
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12-07-2006, 07:37 PM
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#3
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Mike Danahy
Trade:
Signature Painter
Join Date: Oct 2006
Location: Ontario
Posts: 670
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Only buy what you think to be enough for half... (I'd get 2), then purchase the rest based on what you've already used for the first coat. Remember you typically can get a few extra miles on the second coat, especially if your existing wall was flat or primed only to start with.
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12-07-2006, 07:38 PM
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#4
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Mike Danahy
Trade:
Signature Painter
Join Date: Oct 2006
Location: Ontario
Posts: 670
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what type of paint is it that you can only get 300 sq' per gallon? I find in a 10 x 10 room, I can use a gallon, and still have alittle left over...
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12-07-2006, 08:08 PM
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#5
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Professional Painter
Trade:
Owner/Operator
Join Date: May 2006
Location: Serving CT & RI
Posts: 1,306
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880 sq. right?....welp I agree with Joe...3 gallons per, but you will have extra, which in most cases is good anyway--
__________________
Rich
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12-07-2006, 09:43 PM
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#6
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Pro Painter
Trade:
Painting Contractor
Join Date: Apr 2005
Posts: 2,313
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Yup, I'd bid it for 3 gallons. When I'm doing two coats I bid paint (int. walls) at 350 sq. ft./gallon. With a good paint like duration I often get over 400 sq per gallon on the second coat.
__________________
-AAPaint
AA Quality Painting & Pressure Washing LLC
Jacksonville Painters
Jacksonville, FL.
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“Knowledge will forever govern ignorance; and a people who mean to be their own governors must arm themselves with the power which knowledge gives.” -James Madison
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12-07-2006, 10:09 PM
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#7
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Registered User
Trade:
Painting Contractor
Join Date: Dec 2006
Posts: 9
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Use this simple formula to figure the area you need to paint.
2x(length of room) + 2x(width of room) x height of room = area in sq ft.
Remember to take out for windows and doors. Hope that helps!
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12-07-2006, 10:44 PM
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#8
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Deck Designer/Builder
Trade:
Deck Design & Construction
Join Date: Oct 2004
Location: Whitby, Ontario
Posts: 2,138
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Isn't the answer obvious, enough to cover the walls twice! 
__________________
It's a dog eat dog world and I'm wearing Milk Bone underwear - Norm Peterson
www.decksetc.ca
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12-08-2006, 12:04 PM
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#9
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Pro
Trade:
Painter
Join Date: Oct 2006
Location: Pgh, PA
Posts: 235
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Technically it should take 6 for 2 coats. Most paint has better coverage than 300 sq ft though, especially on second coats.
27 + 27 + 28 + 28 x 8 = 880 sq ft
Divided By: 300 sq ft = 2.93 gallons, 350 sq ft = 2.51 gallons, 400 sq ft = 2.20 gallons. Keep in mind the minus areas such as open wall space, doors, windows, fireplaces, ect.
I would buy five gallons but charge for 6 incase I needed it. If I use less, that's good as I made profit on a gallon of paint & have something left over to leave as touch up paint for them. If I need more it's a couple minute drive to the store & cost me nothing.
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12-08-2006, 12:41 PM
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#10
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Thom
Trade:
General Contractor/Homebuilder
Join Date: Nov 2006
Location: Albuquerque NM
Posts: 1,929
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So howcome no-one's including the ceiling?
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12-08-2006, 12:50 PM
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#11
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Pro Painter
Trade:
Painting Contractor
Join Date: Apr 2005
Posts: 2,313
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I don't know about you guys, but I don't take off for doors and windows when measuring for paint. I only take off if one whole wall is an opening or something of that sort, but windows and doors I don't subtract for my paint measurments.
__________________
-AAPaint
AA Quality Painting & Pressure Washing LLC
Jacksonville Painters
Jacksonville, FL.
Quote:
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“Knowledge will forever govern ignorance; and a people who mean to be their own governors must arm themselves with the power which knowledge gives.” -James Madison
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12-08-2006, 03:42 PM
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#12
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Painting Contractor
Trade:
Painting
Join Date: Mar 2005
Location: New Hampshire
Posts: 260
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Quote:
Originally Posted by AAPaint
I don't know about you guys, but I don't take off for doors and windows when measuring for paint. I only take off if one whole wall is an opening or something of that sort, but windows and doors I don't subtract for my paint measurments.
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That is how I do it also...
It is the correct way to do it...
According to the PDCA... dont take off sq ft for windows or doors... UNLESS it is over 100 sq ft... example: 10 x 10 (or more) opening...
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12-08-2006, 04:05 PM
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#13
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Pro
Trade:
Painter
Join Date: Oct 2006
Location: Pgh, PA
Posts: 235
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I don't take off for doors/windows/ect in measuring, but will eyeball it when doing multiple rooms or whole houses. Only because when doing a large house a 1/2 gallon less per room here & there can add up to 3-4 extra gallons (I was mad that day). I don't get all technical with it though just give a quick look around & guesstimate.
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12-08-2006, 07:24 PM
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#14
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Professional Painter
Trade:
Owner/Operator
Join Date: May 2006
Location: Serving CT & RI
Posts: 1,306
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ditto to the last 3 posts 
__________________
Rich
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12-08-2006, 08:20 PM
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#15
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Mike Danahy
Trade:
Signature Painter
Join Date: Oct 2006
Location: Ontario
Posts: 670
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don - Is this for real, or in theory? If its for real, I'm putting a nickle down on 4 gallons...
soooo, how much did it take?
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12-09-2006, 11:12 AM
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#16
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Don
Trade:
Paint Contractor
Join Date: Dec 2004
Location: Winston Salem NC
Posts: 676
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It's for real, a local contractor here in town was bidding same job I was, we were talking in this paticular room when he asked me how I measure my sq ft, I explained to him that I measured it 27+28x2x8. He went off saying how I was messing the measurement up, so I asked him how he did it. This is how he did it. 27x28+8. He argued me up and down about this 
I figured 4 gals on the room one coat.
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12-09-2006, 01:00 PM
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#17
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Pro
Trade:
Painter
Join Date: Oct 2006
Location: Pgh, PA
Posts: 235
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Quote:
Originally Posted by donb1959
He went off saying how I was messing the measurement up, so I asked him how he did it. This is how he did it. 27x28+8. He argued me up and down about this |
Take a pencil & draw the squares out for him. Then put a number in each one & tell him to start counting. 
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