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Topic: Anyone considering a Tin Roof (Read 1604 times) previous topic - next topic

Anyone considering a Tin Roof

I was outside this afternoon and it was 41deg F.  I had to set up an antenna dish network gave me since they are dropping "DISTANCE CHANNELS".  I wanna put this thing up along side my dish up on the chimney so im up the ladder i go then it occured to me how warm my ass was sitting there:shakeass:

Hummm,, then the gears start turning so i go get my meter "meterman 35xp" which comes with a temp probe about 3' long make from K wire.

I run it up under the roof cause i ended up with about an 1'' gap between my shingles and the tin due to the way I installed it.

Outside temp was 41,,,,,,,,,,Under the tin was double that!!!!!

I remember discussing running a continuous zig zag high quality rubber 1'' line on the roof then installing my tin.  The slats i nailed in place provided the room for it and would have been a real nice electricity saver for the water feeding the hot water tank. 

Id suspect there is a math formula here based on my setup that whatever the outside temp is,, the temp under that tin would probably be 50 to 75 percent more.  Im wondering though because at 4:30 pm this afternoon the temp was that high.  The sun is low in the winter and id bet in the summer it might boil water.

anyway,, it was fun doing up an illustration of my own roof top setup and how i built on to my existing shingles.  For those who know the industry of metal roofs,, my roof is not typcical in construction with about 3'' of material atop my wood surface.

and btw,, if you use tin roof on a roof that has plywood followed by tar paper followed by shingles,,, you are suppose to put down a layer fo tar paper atop your shingles then secure the tin to the roof.  If you dont, the tar in the shingles heats and there is a corrosive material that will cause your roof to rust in a matter of just 3 or 4 years.

the roof i have has a 30 year warrenty on the paint alone!!!  my whole roof top costed me 1,200 bux in material.  I did the job with my brother in law.

So if you considering a tin roof,, perhaps there is a way to tame that heat up there and perhaps sucking in the heat up there for a upstairs heating type system via a very small blower motor ect.

see pic

Anyone considering a Tin Roof

Reply #1 –
Sounds to me like your heat is escaping.

Anyone considering a Tin Roof

Reply #2 –
My dad is a trim carpenter and he has started to get into something similar, only he uses solar panels to heat water that flows through tubes installed under the floors in a house.  The entire house can be heated this way and you actually get a tax break for doing it.
-Jim
1987 Cougar LS 5.0

Anyone considering a Tin Roof

Reply #3 –
Quote from: *MAYHEM*;119495
Sounds to me like your heat is escaping.


uhh,, whatever,,lol

Anyone considering a Tin Roof

Reply #4 –
Around here tin (well actually metal, I'm told they are not actually tin, but some kind of aluminum) are all "the rage" lately.  The roofs I have seen are vented at the soffit and the peak to promote airflow between the tin and the sheeting underneath, thus loosing any heating effects.  I have never seen a roof installed over ash fault shingles around here they strip the roof first.  Perhaps that is the key to the heat building up under the tin.  In the great white north, tin roofs are mostly desired because they reduce icing and snow load, but harnessing the heat generated would be a great idea.

This sept. I redid my roof, but could not justify the cost of tin, as  lifetime ash fault shingles have gotten so  cheep ($15 cdn a bundle).  Tin was about twice the price.  Also, my roof is an 8/12 so snow load in not really a concern.

Anyone considering a Tin Roof

Reply #5 –
if you look at how my roof is made,,,whats in between the shingle and the actual wood roof,, i had no choice but to leave it.

stripping a roof of shingles is hogwash,, you dont need to distrub an already good insulation.

i have 2'' of styrafoam sheeting atop the 2x6 roofing.  A layer of tar paper and 30year shingles reside ontop the styrafoam.  Why would i wanna get into all that mess.

Around here we call that peak you mention as a "ridge cap" which it is called anyway. 

i think the air gap in between my shingle and the tin is allowing the heat build up. 

There is a ton of heat under most anything metal facing the sun.  If you think there isnt,, hop up in the loft of a barn on a cold winter sunshinny day and have a seat.  Getting warmer?  Your could not be further from the truth,, a ton of heat is generated under metal roof systems.  I thought it would be nice to share this info with anyone who's building something since i actually went out and did the hands on.

and there isnt much tin roofing out there made from AL.  Galvinized ,yes but AL,, id say thats a price 4x than regular tin.

BTW,, 84lumber tin roof is ,,dont buy it.  Mine is the best money can buy.  I only have one regret.  I did not buy the snow stops.  Even on the pitch you see with my roof, snow build and when it decides to slide off, BOOOOOM on the back deck it lands about 20' down.

Tomorrow when i finish my antenna install, ill take a pic and post up a topic on "DIRT CHEAP GUTTER GUARDS"

Anyone considering a Tin Roof

Reply #6 –
All the aluminum roofing I ever saw was full of holes from branches landing on it, no wonder its not that popular.

I dont find it hard to believe it was that warm on the roof of your house, my house is very well insulated and when I poked my head in the attic while I was up there cleanin the chimney it was toasty warm, atleast +20C to the -15C outside.

What are 'snow stops'?

Scott
1980 birds X 3, 1982 bird, 1984 XR7, 1988 TC

Anyone considering a Tin Roof

Reply #7 –
Quote from: jcassity;119476
.....perhaps there is a way to tame that heat up there and perhaps sucking in the heat up there for a upstairs heating type system via a very small blower motor ect.


Maybe these sites will give you some ideas. The solar hot water project (http://www.thesietch.org/projects/solarthermalpanel2/index.htm) is crude and cheap but describes the concept...

http://www.fieldlines.com/section/remote

http://www.thesietch.org/projects.htm

Anyone considering a Tin Roof

Reply #8 –
Quote from: tbirdscott;119539


What are 'snow stops'?

Scott



I dont know the technical name for them but this is what they look kinda like,,,see pic.

i cut up some spare cutoff roofing parts and made what i thought would stand the test up against snow to prevent it from avalanching off the roof.  They seem to be holding up fine so far. I see my rust on the end of these sections of tin.  Now i remember this is the donor section to the creation of my snow stops cause the tin extended too far over my gutter by 2'' and made them useless.  I see now i have some rust on the edges since it was installed in 99.

Anyone considering a Tin Roof

Reply #9 –
Ahh I just let it fall, keeps me from having to shovel it off, just stay the hell outta the way when it comes down. 6ft snowbank on the sides of the house this year so far, if it keeps up it may make it to the roof line! :D

Scott
1980 birds X 3, 1982 bird, 1984 XR7, 1988 TC

Anyone considering a Tin Roof

Reply #10 –
here are some pics of my temp outside vs my temp under the tin.  the temp was climbing but i needed to get down for a phone call.  still not sure what the real temp is under there.

first pic is outside temp
second pic is under the tin

Anyone considering a Tin Roof

Reply #11 –
We have that on the house we just bought here in NM.  Most of the houses around here have that installed.  I would think it was because of the hot days here (95-110* F) during the summer and windy days.  I have an uncle that has regular shingles blow off during the summer months.