I am going to put a metal roof on a porch on my house. I know nothing about roofing but I have a friend who does. He said we need to put 1x4s to screw the sheets of metal to. Home depot has 1x3s called furring strips which are much cheaper than regular boards. Will these work? Also the distance from peak to eaves is 9 foot would I need three rows of boards or four?

yes you need some sort of roof deck 1x3 will work i would suggest a board every 2 feet plus one at the top and bottom (if you already have plywood on it you dont need to strap it)














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I'd say yes, but 2x4 would be stronger. I'd do at least 4 rows. That'd be one every 3 feet. Every 2' would be better. Kansas wind, y'know. I believe in overkill.

I had a house roof installed last year. They used 1x4 spruce , I would not skimp on the under lay. I would put a 1x8 at the lower edge, then 1x4 on 16 inch centers. .What condition is your roof boards in? We left the asphalt shingles on, and went over., as we have ice and water shield in place, under shingles. . If you have snow and ice load on roof. Install snow stops over doors , to keep snow from sliding off. Good luck. old 243

needs to be strapped you get condensation under the steel so you need an airspace what you use depends on your old roof is it 1" boards or 7/16 osb if the latter you have to screw or nail to the rafters 2x4s on 2 ft. are the norm
till the steel oxidizes a bit snow comes off like shot from a gun if thats an entry way

Put metal on mine last year. Put a Moisture barrier underlayment down and screwed right to the roof, no need for the fur strips.
Just put the Underlayment down.

what is currently down as a roof shingles , or nothing ?

I had old shingles over cedar on my garage

I hired the Mennonite roofer down the road to do it 2 story garage was just easier to let them use a lift them me falling.

they used 2x4 because there was more to cover and because it avoids the waviness you can get with thinner lumber over old shingles

because I already had a roof that served as the moisture barrier steel sweats from the underside.

5 inch ring shank nails to get down in to every joist with the 2x4s those were 16 inches apart start at the bottom and go 16 on center with the 2x4 laying on the 3 1/2 inch side 3 spikes into the framing and not just the deck like your cross staking a trap

the wood furring is to have something to get a good purchase on and why 2x4 are popular they generally don't cost much more than 1x either can work with the right screws and decking below

if you have a door below a snow bar can be mounted to hold the snow from shooting off and making a pile in front of the door or landing on you

This is what I did 3 years ago. No problems.

Ours was done this way 5 years ago with no problems.

I have removed the shingles. The roof is chipboard. What do you use as an underlayment instead of boards. Which one is easier?

Definitely put down a moisture barrier. Even 30# felt would help. Nothing with stones in it. Rubs through and rusts eventually.

Moisture barrier and go. No need to strip it. Go to supplier and get the best they have no stone or pebbles.

Titanium udl is what is under mine.

If you have already stripped it down to the bare roof deck, I would cover it with something like Grace Ice & water Shield and then ALSO use strapping.. Chip board does not hold screws well over time in windy country. I would space the strapping not greater than 24" o.c. You might need to walk on it someday and 29 gauge metal will bend or kink in unsupported spans greater than 24". It will in 24" also if you aren't careful.

1x6 pine/spruce or 2x4 is what I would use

That Grace is some good stuff, used it for years. Spendy thou!

my parents neighbor put a flat slightly pitched roof on his garage more than 40 years ago he intended to do something better but ran out of time so he put down 2 layers of 30 pound felt and went over it with a bucket of tar sealer. well short on time again the next year he just sealed it again.that kept working so he kept doing it a bucket of tar for when I had talked to him last more than 30 years never a leak. he is 92 now not sure if he still gets up on the roof to seal it , he might


a roll of felt staple it down good and run some sealer over it and furring strips and steel and your good for a lot of years. price that agaist the graces ice sheald it is good stuff and ifit is not a big area it would be the fastest option.

Interesting theory.........any reasoning as to why this happens?

the problem comes from the screw going through the roof with the temperature difference condensation will build up on the screws and it will soak up into the wood and loosen the screws