SUNLIGHT WILL CAUSE ACCELERATED AGING ON PEX

DO NOT    leave tubing exposed to direct sunlight for more than 30 days
DO NOT   
forget to insulate exterior rim joists
DO NOT    take tubing off the end or side of coil ROLL IT OUT
DO NOT    leave adhesive tapes on tubing
DO NOT    allow kinks to remain in the tubing see SPLICES
DO NOT    allow debris to enter tubing, keep ends of tubing taped
DO NOT    allow tubing to rub on electric wire while pulling tubing
DO NOT    allow electric wire to rub on tubing while pulling wire
DO NOT    put heat under food storage areas
DO NOT    place the tubing close to recessed lights, insulate the tubing
DO NOT   
place tubing within 18 ins. of exterior slab edge
DO NOT    allow tubing to sag, support every 12 to 16 ins.
DO NOT   
install heat under toilet, it could melt the wax ring
DO NOT    purchase tubing that has been stored outside.
DO NOT    use wool carpet
DO NOT    use cork floor coverings unless they are very thin

   Pex-A and Pex-B are both acceptable and will outlast any house you install them in. Pex-C and Pex-Al-Pex is not good and can fail if frozen or subjected to some installation methods.
   Pex-A is not better tubing than Pex-B, the A-B letters simply indicate that the Pex-A process was invented before the Pex-B process. Pex-A is slightly more flexible than Pex-B, Pex-B is more uniform in wall thickness and will often outperform Pex-A in strength both in freezing and temperature performance. 

REMEMBER TO STAPLE UP WARNING SIGNS ONCE YOU START INSTALLING TUBING

EXTRA CARE MUST BE TAKEN  IF INSTALLING TUBING IN VERY COLD WEATHER

Avoid putting heat under toilets, refrigerators, freezers and pantries. If tubing goes under these areas, insulate the tubing with  foam pipe insulation, or put 2 ins. of high density foam insulation under the appliance or floor.