You may need to contact a professional roofing contractor.
How mamy shingles off roof before it has to be replaced.
Some shingles become discontinued and repairs cannot be made due to the roof shingles being unavailable.
This can happen if a piece of debris has been blown into your roof thereby causing a piece of shingle to break off.
If a shingle is missing your roof becomes vulnerable to the elements especially wind and rain.
If you have a 40 year old roof there could be a problem even if it looks good from the ground how much time you ve got left.
If you can see original wood shingles on the underside of your roof when you re up in the attic you ll need not only to tear everything off but also to install new plywood decking all of which likely adds 5 000 or more to your costs.
Moss can be brushed off but it won t prevent it from growing again.
Five to 10 years depending on your roof s condition.
If the shingles are backed with adhesive strip remove the covering and push them into place then nail them to secure them.
Follow the directions of the shingles that you purchase or use the other shingles on the roof as a guide.
Take care not to damage the shingle surface.
The tear off gets a lot more complicated if you have something other than asphalt up there.
Moss holds moisture against the roof surface and overtime in freezing climates can cause damage to the granules on the top of the shingles.
There are missing shingles missing shingles will need to be replaced right away.
Lastly the shingles have to be currently available on the market.