________ is a flexible material and is placed on the bedding of concrete or mortar.
(a) Mastic asphalt
(b) Hot bitumen
(c) Bituminous felts
(d) Metal sheets
I had been asked this question in an online quiz.
This question is from Dampness in chapter Damp Proofing, Water Proofing and Termite Proofing of Construction & Building Materials