It is still a popular decking timber and is less expensive than most other decking timbers. Merbau has a high durability rating of 2 and is rot and insect resistant. Much of the merbau used today ...
Probably the most difficult decision to make when building a deck is what type of decking to use. All three choices—5/4 x 6-in. radius-edged cedar, pressure-treated and composite decking—share similarities.
If you want to use IPE decking material outdoors, then it is best to buy the air-dried IPE decking. If you use it inside, it will shrink, so it is intended only for outside use. It is also possible to use this kind of wood decking indoors.
Decking will not work, to thin. If you have a saw mill close by, go get rough cut 2 x 8 oak, and treat it with some weather sealer before installing. It will outlast the treated pine at the box stores.