View Full Version : Mulch for a large Triangle

KillaWhale

03-27-2005, 09:37 PM

I have searched and found some answers, but it just does not seem right. I am hoping you guys can clarify this for me.

What I have is natural area that is in the shape of a triangle

129' long side, 82', 54' base. New bed so I want 3" cover. I keep coming up with 42-43yds. At 28dollars(for the customer) a yd, thats like 1200 dollars for mulch not installed. Please tell me what the h@ll I am doing wrong. This is also only 2/3 of the job for the homeowner. Thanks everyone on here for your constant help for a noobie.

TerraVenture

03-27-2005, 09:57 PM

I calculated 47 yards. It seems you are calculating correctly.

LB1234

03-27-2005, 10:02 PM

The area of a triangle is 1/2 base times the height. However...you did not provide the height of the triangle and you obviously do not have a right triangle (pythagorm's (sp?) thereom doesn't work). So, I'll have to make an assumtion...Assume 54' is your base...half that is 27'...times 82' (your height) you get 2214 square feet. At 3" depth I'll gestimate ~21 cubic yards of mulch. About half of what you are calculating...so at your 28 per yard...say twenty yards...material cost to you is 560...

lrose2

03-27-2005, 10:13 PM

The calculations of LB1234 seem right to me.

As mentioned above, assuming a right triangle..... .5 x base x height = 2214 sq. ft. x depth of 3" or 3"/12" = .25' for a total of 554 cu. ft. Divide this by 27 cu. ft. in 1 cu. yd. = 21 cu. yd. of mulch. payup

KillaWhale

03-28-2005, 02:52 AM

129' I thought would be my height base on that is the longest side. 54' is my base and 82' was the angle side. The way it sounds is that it is around 43-44yds. Wow, so I guess it going to be 1200 bucks for mulch alone. Homeowner is definitely not going for that. Oh well, present bid and see what happens. Thanks everyone for the input.

KillaWhale

03-28-2005, 05:16 AM

Any bark blowing companies in Triad Area, NC.

TScapes

03-28-2005, 08:31 AM

129' I thought would be my height base on that is the longest side. 54' is my base and 82' was the angle side. The way it sounds is that it is around 43-44yds. Wow, so I guess it going to be 1200 bucks for mulch alone. Homeowner is definitely not going for that. Oh well, present bid and see what happens. Thanks everyone for the input.

How are you calculating the 43-44 yards? Everyone showed you their formulas in their posts. Even if you take your 1/2 x 129(b) x 54(h) = 3483 x .25 (3") / 27 = 32.25 cubic yards.

So, at your $28 per yard that comes out to be @$900.

TerraVenture

03-28-2005, 10:54 AM

Sorry, I didn't understand the lengths of your triangle. If I understande correctly the sides are 129feet, 82feet, 54feet. If that is correct I drew it in autocad and checked the area using the program and it is 1355.88 sqft. At 3" it is (1355.88sqft*3"/12")/27cuft/yard = 12.55 cu yards. @28/yd that is $351 for the mulch.

MarcSmith

03-28-2005, 12:46 PM

I actually drew the triangle out. i used 12.9" as my base. I then used a compas to scribe a 5.4" radius arc starting at one end of the 12.9 line and then on the other end of the 12.9 I arced a 8.9" radious arc. where the two arcs meet is the H of the triangle, in my case 2.3 ". if you use 129 as the B and 23 as the H...... 1/2BxH= .5*129*23=1483sqft x.25ft= 371 cuft or 13.73 cuyds...

the 1/2bxh will only work if you know the H which would be at a right angle (90) to the base

Other formulas-

area of a circle Pi*r*r

Cirfucrenece of a circle Pi*2*r or Pi*d

pi-3.1415927

r=radius

d=diameter

KillaWhale

03-28-2005, 02:28 PM

I appreciate it guys. I knew 45+ yds sounded way to much. I will bid 14yds(taking MarcSmith and TerraVenture's calculations). This place is so helpful. Off to finish bid.

MarcSmith

03-28-2005, 02:43 PM

Whover though that Geometry wouldn't be helpful...or worth money...It would have been nice to bid and get it at 45 yards, so long you did not end up with 45 yards being delivered to home and then having to figure out what to do with the extra 30 yards....or explain the over charge to the client.

KillaWhale

03-28-2005, 02:50 PM

That would be a nice extra 1000+ in the bank on a 500+ job.

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