LD1
Epic Contributor
Gonna be helping a friend of mine put a new roof on his house. My house will get a new roof at some point as well so the question becomes....when going from shingles to metal, what is the BEST way to do it. Cause it seems there is a handful of different ways, and just like building a pole barn....each contractor has their own way they want to do it, and reasons why.
No contractor will be used in this case. That was just for an example.
1. Roll out some kind of barrier like felt and put metal directly down. I have seen some contractors do this, and say it's just fine.
2. Put down 1x4 slats for "purlins". Leaving the shingles there. Attach metal.
3. Remove shingles and put metal directly to sheeting.
4. Remove shingles...but barrier, install metal to sheeting with barrier between
5. Remove shingles, slat with 1x4, install metal
These 5 methods I have all seen used. And all have pros and cons. Leaving shingles on is less mess, less labor, and less likely to damage anything inside the house IF something on the metal roof leaks....since it's essentially double roofed.
But the concern the. Is trapping moisture between the metal and shingles.
Slatting/purlins adds height...either with shingles on or off. Makes facia and trim pieces all need made taller and probably replacing facia boards to accommodate, and readjusting gutters, etc.
No slatting and the concern is thermal expansion of metal rubbing on whatever is under it. Either shingles or the sheeting. Ultimately wearing off the paint/coating and rusting due to condensation.
So....when building a bran new house from the get go and planning/designing for a metal roof.....what's the "approved" method?
For now, assuming just ribbed metal siding like a pole barn. But may not rule out some of the newer products made of metal....like the ones that look like shingles. Don't know if the method for installing them changes....but obviously those probably wouldn't work just purlins or slats. And I don't think standing seam would either. They need the support of sheathing.
So I know there are a lot of builders and remodelers on here....so just curious what method you prefer and why? Or any real life horror stories with any of these methods....or something that cause significant issues long-term
No contractor will be used in this case. That was just for an example.
1. Roll out some kind of barrier like felt and put metal directly down. I have seen some contractors do this, and say it's just fine.
2. Put down 1x4 slats for "purlins". Leaving the shingles there. Attach metal.
3. Remove shingles and put metal directly to sheeting.
4. Remove shingles...but barrier, install metal to sheeting with barrier between
5. Remove shingles, slat with 1x4, install metal
These 5 methods I have all seen used. And all have pros and cons. Leaving shingles on is less mess, less labor, and less likely to damage anything inside the house IF something on the metal roof leaks....since it's essentially double roofed.
But the concern the. Is trapping moisture between the metal and shingles.
Slatting/purlins adds height...either with shingles on or off. Makes facia and trim pieces all need made taller and probably replacing facia boards to accommodate, and readjusting gutters, etc.
No slatting and the concern is thermal expansion of metal rubbing on whatever is under it. Either shingles or the sheeting. Ultimately wearing off the paint/coating and rusting due to condensation.
So....when building a bran new house from the get go and planning/designing for a metal roof.....what's the "approved" method?
For now, assuming just ribbed metal siding like a pole barn. But may not rule out some of the newer products made of metal....like the ones that look like shingles. Don't know if the method for installing them changes....but obviously those probably wouldn't work just purlins or slats. And I don't think standing seam would either. They need the support of sheathing.
So I know there are a lot of builders and remodelers on here....so just curious what method you prefer and why? Or any real life horror stories with any of these methods....or something that cause significant issues long-term