Comments for Roofing Materials

Comment on A roofing tile falls from rest off the roof of a building.? by Physicsquest

Physicsquest — Thu, 04 Mar 2010 21:06:59 +0000

2.2/0.37 = average speed = 5.946 m/s

velocity at top sill = 5.946 – ((0.37/2) x 9.8) = 4.133 m/s

v = at

4.133/9.8 = t = 0.42173 secs

since the tile fell from rest

s = 1/2gt^2

4.9 x 0.42173^2 = 0.8715 m (answer)
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Comment on A roofing tile falls from rest off the roof of a building.? by RickB

RickB — Thu, 04 Mar 2010 20:17:59 +0000

The distance the tile falls in a given time "t" is:

d = ½gt²

Apply this to the the upper windowsill: call its distance (from the roof) "d1", and the time "t1":
d1 = ½g(t1)²

Apply it to lower windowsill ("d2" and "t2"):
d2 = ½g(t2)²

> "…windowsills that are 2.2 m apart…"
This means:
d2 – d1 = 2.2m
or:
½g(t2)² – ½g(t1)² = 2.2m
or, simplified:
½g((t2)² – (t1)²) = 2.2m

> "…takes 0.37 s "
This means:
t2 – t1 = 0.37 s

The rest is algebra. Solve these simultaneous equations to get t1 and t2:
½g((t2)² – (t1)²) = 2.2m
t2 – t1 = 0.37 s

Then, use "d1 = ½g(t1)²" to get d1
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Comment on Solar Roof Shingles: 2010 International Builders Show by depro9

depro9 — Fri, 26 Feb 2010 10:41:07 +0000

wtf, why so …
wtf, why so expensive!? I mean COME ON, really!

Comment on I have a landscaping question. It appears that one of my trees in my back yard has some exposure.? by Steve C

Steve C — Fri, 26 Feb 2010 00:16:59 +0000

RScot is talking about bark traceing. I have done this many times. pruneing spray’s should not be used,it will habor insects& diease’s. let the tree heal naturaly.
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been in the tree busness for 30 years

Comment on I have a landscaping question. It appears that one of my trees in my back yard has some exposure.? by RScott

RScott — Thu, 25 Feb 2010 23:39:59 +0000

As a few have already said, sealers should never be used. The best you can do is use a sharp knife to remove any frayed or damaged bark. Also round off any sharp angles to the wound to give it a rounded or oval shape. RScott
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Comment on I have a landscaping question. It appears that one of my trees in my back yard has some exposure.? by trehugr4life

trehugr4life — Thu, 25 Feb 2010 23:26:59 +0000

don’t use any kind of pruning sealer… let the tree heal itself… you may need to prune that area out of your tree… winter will not hurt the tree wound; however, wrapping it will provide a good habitat for insect/disease
you can get more, free info about how to deal with tree issues in your county/state by contacting or visiting the web site of your county university extension agency. Search for: University of yours state your county horticulture extension agent. For example, mine is: University of Wisconsin Brown County Extension
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Comment on I have a landscaping question. It appears that one of my trees in my back yard has some exposure.? by askdryad

askdryad — Thu, 25 Feb 2010 22:38:59 +0000

You should be sure of what caused the damage – whether it was someone using equipment incorrectly, a dog scratching at the tree to get a squirrel, etc. Also, do not cover the wound with anything without identifying the problem. If it’s a natural event then the tree should heal itself. Using the old pruning paint is not recommended any longer as it doesn’t allow the tree to heal properly and isn’t really needed. (Never use cement to "heal" a tree.) If it’s a small tree I would leave it and see how it does over the winter – and definitely try to identify the cause. If it’s an older tree call an arborist to have him/her check it out professionally.
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I’m a landscaper

Comment on I have a landscaping question. It appears that one of my trees in my back yard has some exposure.? by hasicit

hasicit — Thu, 25 Feb 2010 22:08:59 +0000

try electricians or even duct tape .leave till next summer then remove if bark starts growing
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Comment on Where can I get large quantities of broken roofing tile for free in sacramento? by aer w

aer w — Thu, 25 Feb 2010 21:55:59 +0000

Cant asnwer your direct question, but having worked for ceramic company I say:

"un fired" problematic products : go back to mixing preparation area.
"fired" problematic products : % 5 goes to grinder and mixing area, % 95 goes to garbage. (and we pay for every truck, both transportation money and garbage money)

So in my firm people can take free "fired + defective" products, or other way we pay for it to garbage.

For my opinion check the companies around from the web, and possibly phone to them. Dont get tired, one may be more should be accept, but tell them you have your own truck and you will transport.

IF they wanna sell to you dont pay more than 1/8 of their 1st quality selling price.

If the product is glazed, and the more higher the firing temperature, the more "garbage" is defective product.
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Comment on I have a landscaping question. It appears that one of my trees in my back yard has some exposure.? by david m

david m — Thu, 25 Feb 2010 21:40:59 +0000

I think someone might have intentionally removed the bark. However, nothing will happen to it whether it is young or old. Trees have the ability to heal its wounds or cuts because they undergo secondary growth where new lateral cells are produced and the existing ones are sloughed out to form the bark. If you think another means can also help then go ahead with it. I'm a botany student in a certain University.
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