Check if there is a manufacturer's warranty before anything is done to make sure that you don't inadvertently void it.

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Q: I have an asphalt-shingle roof that I am thinking of replacing.

In our neighborhood I have seen other roofs replaced. Some have had the old shingles removed, and others have had the new shingles installed over the existing ones. Is one way better than the other?

I imagine putting new shingles over the old ones is cheaper, but is it as good?

A: It is cheaper, but I’ve never considered it wise. My roof was done just before I bought the house, and I’ve seen just one layer underneath. Most of my neighbors have new roofs, and the roofers took off the old to make sure the decking was solid and what needed to be replaced was done.

If there is just one layer of shingles on the roof and you are adding one more, then, yes, it might be all right. From what I’ve read, most roof structures can support a couple of layers of shingles without causing problems.

It is important, however, that the roof underneath be able to accommodate the one being installed on top of it. If a lot of the old shingles are curled, the new ones might assume that shape.

Does the existing roof leak? You might be covering it over rather than repairing it.

There is also a manufacturer’s warranty to check out before anything is done to make sure that you don’t inadvertently void it.

Q: Two of my sisters have made renovations to their bathrooms. They have removed the bathtubs to replace them with walk-in showers.

They only have other half-baths, therefore no other bathtubs. What are your feelings regarding sale values of homes if no bathtub is available in the house?

A: Although we have become a people that appears to favor the quick shower over the long bath, most buyers want to have the option available.

I can see a point in having just one tub in the house rather than in every bathroom, but I wouldn’t go out of my way to remove one, especially if it did the job.

Older bathtubs tended to be shorter than modern ones. People who use tubs prefer to stretch out in them rather than curl up their legs. If the existing tub was, say, 4 feet and I could add a longer one without having to spend thousands of dollars to do so, I would.

You cannot assume that buyers’ tastes will be just like yours, especially in a resale market in which those who are looking want everything to be available and don’t want — or have — lots of money to make it so.

They’ll just move on to the next house.