TheGoose said:Both the ones you listed from Grainger were schedule "DWV" .
If it was me, I would go with regular 90's and spend my money making them sch 80. If I ever re-plumb my pool all fittings will be sch 80. I think you're splitting hairs with the long radius sweeps.
Not to mention I would think the long radius sweeps would be more prone to cracking/failure. I have had to replace several fittings under the deck through the years and I would do anything I could to avoid having to fix failed fittings.
Not sure why you would think a long sweep would be more prone to failure.
If your mastic has gaps you might have water getting under the deck increasing ground movement. Might also try backfilling with sand if you dig things up again.
We are going to replace our deck with pavers and the ability to correct future issues is one reason. We had our driveway redone in pavers and a year later PG&E discovered a broken powerline underneath. We were able to remove the pavers, dig a 4' access hole, fix the issue and place back the pavers.