When asphalt shingles were first used, it was done all the time. The problem is that the shingles will not lay flat which give the roof an uneven appearance and makes them much easier to puncture by walking on them or with hail. No one does this anymore, strip off the cedar and put plywood or OSB over the space sheathing. More work and expense, but worth it in the long run.
cupping - improper installation of shingles over existing shingles
Would not recommend do to the weight and unevenness of the metal roofing material also the potential for leaks
To properly install ridge cap shingles on your roof, follow these steps: Start by measuring and cutting the ridge cap shingles to fit the length of the ridge of your roof. Apply a bead of roofing cement along the top edge of the ridge. Place the ridge cap shingles over the ridge, making sure they overlap each other and the roof surface. Nail the ridge cap shingles in place using roofing nails, ensuring they are securely fastened. Apply additional roofing cement over the nails and seams to seal and protect the ridge cap shingles. It is important to follow the manufacturer's instructions and safety guidelines when installing ridge cap shingles on your roof.
#1. Of course somebody may have sold lefto'r roofing shingles on Ebay. I once sold half of a cheeseburger on ebay. #2. Perhaps you should do it and then you would know a definite answer. #3. Thank you for asking this question.
I am not sure if this question is worded correctly. 1) To add rolled roofing under shingles is not a recommended method of installation. What will work is to install a layer of Ice & Water Protection such as Grace Ice & Water Shield prior to the installation of your shingles. 2) If you meant to ask about installing rolled roofing over your shingles or installing shingles over your rolled roofing this is once again not recommended but is commonly done. You would first make sure the surface is level and remove all loose debris from existing roofing materials and or dirt, leaves, etc.. Just a quick clean up and sweep should be good. Then if the existing roofing materials are leaking I would recommend you either remove them and do this installation properly or at least install a layer of underlayment such as a heavy 30# felt paper or RoofTop Guard II over the existing materials. Then install the new materials following the manufacturers specifications. Once again this is not the recommended procedure and will void all manufacturers warranties.
The felt is not to keep the sheeting dry...it will be fine Your shingles keep the roof dry...the felt is for insulating and non sweating characteristics which makes your shingles last longer.
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Your roof might get damaged for a variety of reasons and might allow damaging agents such as moisture and dust to enter your home. Furthermore, other roofing materials are damaged by various agents and require different kinds of repairs. Regardless of the type of roofing material you use, whether it is clay tiles, concrete shingles, metal panels and seams, synthetic roofing, slate shingles, or any other roofing material available, you must maintain and repair your roof over time so it can continue to deliver excellence. In Courtenay, BC, Ironwood Shake & Tile provides metal roofs for homes and businesses. With our company, you can be assured that you will receive high-quality roofing services. It is my hope that this information will be helpful to you in answering your question.
To install ridge cap shingles on a roof, first, ensure the roof is clean and dry. Next, apply a bead of roofing cement along the ridge of the roof. Place the ridge cap shingles over the cement and nail them down securely. Repeat this process until the entire ridge is covered. Finally, seal the edges with more roofing cement for added protection.
All roofing shingles and tiles naturally stand up to the elements over a good period of time. Asphalt roofs are less expensive than a tile roof and they channel water better.
You can, but it is not recommended. It used to be done all the time when asphalt shingles first started to be used. It makes for a lumpy roof and will puncture easier from hail or being walked on.
Roofing drip cap along the bottom edge of the roofed surface will go under the roof underlayment and shingles. Along the pitched edges of the roofed surface, the drip cap should be installed over the underlayment, but under the shingles.