Need a little help with building material options. I built 3 custom outdoor table tops out of 30” round, 1” thick wood I ordered online. They are essentially 1x4 boards bonded in parallel with a rounded edge. I live in AZ and they are exposed to direct sunlight all day and have been in 100-110 degree heat the last few months and we’ve had a heavy monsoon season with drastic changes in humidity. Consequently they warp and break at the glued seams despite being sealed and painted with exterior grade house paint.
I’m trying to find a synthetic/composite option. I looked at aluminum and steel but its rather expensive and would be extremely hot to the touch. I think a composite material similar to what composite fence slats are made from would be a possibility but cannot find it in a sheet. The table tops can’t be too heavy as they need to be mobile periodically so concrete may not be an option.
Thank for any input the community can provide.