If you think you’ve been exposed to asbestos, here’s what you should do. https://www.heatingair.org/ Consult a doctor. Talk to your doctor if you think you’ve been exposed to asbestos. They can help you determine your risk of developing an asbestos-related disease. “The good news is that one-off, limited exposure to asbestos is typically harmless short and long term. Most of the people who develop asbestos-related ilnesses were exposed to the material on a regular basis. These diseases usually take a long time to develop. Most people don’t have symptoms until 10 to 40 years after exposure, the National Cancer Institute says. If your doctor knows that you’ve been exposed to asbestos, they may monitor you for symptoms. If symptoms occur, get a diagnosis The signs of asbestos-related diseases can be similar to other health conditions. People with these diseases may have shortness of breath, chest pain and a chronic cough. Some asbestos-related diseases can also make you cough up blood or lose weight without trying to. To diagnose diseases associated with asbestos, doctors may use a variety of lung tests. Imaging tests, including chest X-rays or computerized tomography (CT) scans, can help your doctor spot changes in your lungs. Your doctor may also ask you to blow big breaths into a machine to see how well your lungs are working.

As long as the new carpet is installed properly over the old carpet to avoid tripping hazards for the children, and the old carpet/cushion is not wearing away prematurely, it is possible. We have done this in the past for customers with limited budgets who would sign a waiver of installation guarantee. The new carpet will require more maintenance. If you do this yourself you can save money. If you can not then it will most likely cost you MUCH more than the price of new cushion over the life of the new carpet. The new carpet will wear at an accelerated rate and unevenly depending on the wear patterns on the old carpet now used as cushion, the latter of which may be able to be mitigated by re-arranging the room items and furniture so new wear patterns emerge. Additionally, restretches may be required more frequently because the above and the old carpets pile direction that may aid the new carpet "walking" the direction of the pile due to foot traffic (walking/running/rolling/playing on the carpet). This may also cause "rolling" of the carpet (a trip hazard) if left unchecked without proper re-stretching. Another problem may be the height. If the new carpet is to high, the new carpet might not want to hold well at the tack strip, so another row of tack strip and/or some additional anchoring might be required to back up the first-row or existing tack strip. Be warned that if alternate anchoring is used (backup nails or staples through the new carpet), this may make required restretches problematic at best, impossible at worst. All that said, I think its a MUCH better idea to go with full demo and new cushion. Decent mid-grade 8 lb rebonded cushion is very inexpensive these days and lasts for many many years. Remember that this is a kids playroom. They will beat the crap out of it. Cushion is specifically designed for under-carpet applications to mamximize the life of your new carpet. Its an investment insuring the longevity of your new carpet. Go with new cushion is my recommendation.

First, I have about 20 years of experience selling carpet cushion on the manufacturing level. The L&P synthetic cushion will be fine except it won't feel like much. Part of the benefit of using a carpet cushion is that it provides some cushion when you walk. Synthetic fiber cushions are very dense and provide little comfort under foot. The 40oz. version that has been recommended to you is the most comfortable of all the fiber options, so you may find this acceptable. There are a number of polyurethane cushions that will feel better when you walk on them that are treated to be mold and mildew resistant. Most major cushion manufacturers offer a bonded or prime polyurethane cushion with this feature. I am not sure I agree with the comment that synthetic fiber will "allow the carpet to breathe." Not sure how that is possible. Good luck, Jeff

Gosh, I'm not an expert but 4 x 4 ought to be OK. When you think about it, old time strip hardwood went down over just a subfloor so I don't see a problem. Other than it may be a bit more difficult to stagger seams just because you'll have more of them. No doubt full sheets would be preferable but sometimes you just gotta' do with what you have. Another thought--maybe rip the sheets lengthwise and put down 2x8 sections? Easier to handle than a 4 x 4?? Yes, you can do without the glue. I followed instructions that I found from some experienced floor guy on the internet somewhere (it's been a few years ago) and did the glue because my subfloor is only 1/2" plywood with visible dips and sags between joists and because the old floor was a squeaking nightmare. Also, it is a large high traffic kitchen/ great room where we removed two partitions and where squeaking would annoy me all day, every day. You're dealing with a bedroom, maybe even a spare bedroom? I had to sift thru a lot of information to even find how to deal with my situation of having only 1/2" ply. Sure wasn't up to removing it and having to walk on joists to install a thicker subfloor. The glue was extra insurance. Oh--I know you said that you knew to stagger seams; I assume you also know that the second plywood layer goes on perpendicular to the first layer? Mentioning just in case... Not something we do everyday so it's easy to forget even stuff we already know!