Shingling over existing shingles?
- Thread starter wazup
- Start date
Blah Blah warantees etc?
If that's the case why ask for opinions? A neighbour down the street did it and had to remove the roof after two years and start again. The old shingles with the new shingles on top caused the plywood to sage between the trusses. In other cases the new shingles were not held down properly as the old shingles deteriorated under and caused a space to form. The new shingles became loose and were blown off with the wind.
Other than that I think its a wonderful idea.
If that's the case why ask for opinions? A neighbour down the street did it and had to remove the roof after two years and start again. The old shingles with the new shingles on top caused the plywood to sage between the trusses. In other cases the new shingles were not held down properly as the old shingles deteriorated under and caused a space to form. The new shingles became loose and were blown off with the wind.
Other than that I think its a wonderful idea.
These days they have full roofing systems that intergrate the shingles ice sheeting and the vents into one sealed whole. As well removal can head off any rot problems ahead of a leak.
Bite the bullet. They are now rated for 25 years and not as expensive as you think. And doing it properly can also offset insurance costs.
Bite the bullet. They are now rated for 25 years and not as expensive as you think. And doing it properly can also offset insurance costs.
How old is the house,, if it is plank roofing 2 layers are fine, if plywood on 24in centre trusses than best to strip.. on a plank roof I have gone 3 layers but that was pushing it,,, trouble was when I had to strip it cost of disposal and labour tripled...
House is 70 year old bungalow, 1000 sq ft. Its a 4 sided roof, hip style i believe it's referred to.
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I roofed for a few summers.
I’ve never met a more fucked up bunch of of construction guys who will literally drop everything for a buddy who needs help now, even if it’s quasi legal.
Still stay in touch after all these years. It’s nice having rough dudes as friends.
I’ve never met a more fucked up bunch of of construction guys who will literally drop everything for a buddy who needs help now, even if it’s quasi legal.
Still stay in touch after all these years. It’s nice having rough dudes as friends.
, thanksI bet you can get it done for well under $10000. I did mine for $5000 about 6 years ago. A bit smaller roof (2 story).
Never do a pound over.
Its false economy.
The new shingles won't sit flat on top of old cupped shingles, old shingles will continue to tear, adds unwanted dead load to roof structures. I'm not even sure how you would contend with valleys, flashing, ice and water shield around the perimeter (can't be done). Worst of all, the new shingles have an adhesive strip that melts to secure the layer of shingles together. If the new shingles are not flat, doesn't work.
Warranty on new shingles offered by the new shingle manufacturer will not be honoured.
No reputable roofing company will do a pound over. Not ever.
Its false economy.
The new shingles won't sit flat on top of old cupped shingles, old shingles will continue to tear, adds unwanted dead load to roof structures. I'm not even sure how you would contend with valleys, flashing, ice and water shield around the perimeter (can't be done). Worst of all, the new shingles have an adhesive strip that melts to secure the layer of shingles together. If the new shingles are not flat, doesn't work.
Warranty on new shingles offered by the new shingle manufacturer will not be honoured.
No reputable roofing company will do a pound over. Not ever.
Totally agree. You also want to examine state of the plywood sheeting before putting new shingles on. There may be rot that needs remedying. If you have trees near the house, this is how squirrels and raccoons find their way in. Raccoons actually look for soft spots in a roof then they start burrowing in. They are very crafty.
The roofers I dealt with over the years say up to 3 layers, even though they can make more money by doing removal and replace. Also, a very steep roof might get away from no shingles for rain but much better to have shingles to protect the underlying plywood or whatever.
BTW: What do I know, since I'm not a roofer and don't have the guts to climb up on my roof?
In my area every house that is being redone they have stripped the old stuff off. Doubt the newer homes have the capacity to carry the weight of multiple layers of shingles. Those who have opted to install a metal roof the old shingles have remained.
Noticed metal roofing is gaining in popularity in my area.
think the cheap builder shingles have a life span of 10 to 15 years.
the houses in my area currently being redone you can tell the shingles look of better quality. Probably good for 20 years.
metal have a warranty period of 50 plus years.
Good point. I'm sure newer homes have 1/2" plywood rather than 5/8" or 3/4". And I certainly hope building code doesn't allow OSB for sheeting. God help us if that was allowed.
You will have plank roofing likely at that age - unless the whole thing was redone more recently. But the little bit you might save by just going over it with another layer is not worth it at all. For all the reasons various people have noted.
GAF Timberline shingles, when we had our roof re-shingled, offered a written limited lifetime warrantee. It pays to remov eth eold shingles, as previous posters have said, to check the roof boards, and also to put protective membrane under the shingles for further protection (not just tar paper, BTW).
What I have noticed is that when I see drone footage of houses after a storm, hurricane, tornado, etc. It is the newer houses that are missing roofs and you can see their furniture, etc. inside the house.
It's a struggle to get 5/8" even on high-end custom homes... The carpenters just will not lug up the 3/4". With a concrete tiles, etc., you'll get the 3/4".
Plywood is required for the roof as OSB will suffer from edge swelling... The swell 'bumps' will transmit through the shingles. I have a kitchen floor done in OSB and the swelling is popping my tiles... I hate it.
