A building assembly comprising, a supporting member comprising a base having a front and rear sides (1111, 1112), a channel disposed on the front side of the base at the center thereof, and a pair of rails independently disposed next to the channel, in which the channel, and the pair of rails independently extends along the entire longitudinal length of the base; a pair of a first sealing members independently comprising a first base portion having a front and rear sides (1211, 1212), and two retention tongues (122a, 122b) independently extending outwardly from the rear side of the first base portion along the entire longitudinal length thereof; an elastically deformable gasket having a U- or V-shaped space in cross section and two flanges independently extending laterally from one edge of the U- or V-shaped space; and a second sealing member comprising a second base portion having a front and rear sides (1411, 1412), and a rib disposed on the rear side of the second base portion at the center along the longitudinal length thereof; wherein, the pair of the first sealing members are configured to engage with the supporting member via press-fitting the two retention tongues (122a, 122b) of each first sealing member into each of the pair of rails of the supporting member, thereby creating a pair of pockets independently for receiving each a construction panel therein; the elastically deformable gasket is configured to be snap-fitted into the channel of the supporting member to help holding the two construction panels in the pair of pockets; and the second sealing member is configured to engage with the elastically deformable gasket via press-fitting the rib into the U- or V-shaped space of the elastically deformable gasket so as to hold the elastically deformable gasket in place while creating a tight-seal therebetween. a supporting member comprising a base having a front and rear sides (1111, 1112), a channel disposed on the front side of the base at the center thereof, and a pair of rails independently disposed next to the channel, in which the channel, and the pair of rails independently extends along the entire longitudinal length of the base; a pair of a first sealing members independently comprising a first base portion having a front and rear sides (1211, 1212), and two retention tongues (122a, 122b) independently extending outwardly from the rear side of the first base portion along the entire longitudinal length thereof; an elastically deformable gasket having a U- or V-shaped space in cross section and two flanges independently extending laterally from one edge of the U- or V-shaped space; and a second sealing member comprising a second base portion having a front and rear sides (1411, 1412), and a rib disposed on the rear side of the second base portion at the center along the longitudinal length thereof; wherein, the pair of the first sealing members are configured to engage with the supporting member via press-fitting the two retention tongues (122a, 122b) of each first sealing member into each of the pair of rails of the supporting member, thereby creating a pair of pockets independently for receiving each a construction panel therein; the elastically deformable gasket is configured to be snap-fitted into the channel of the supporting member to help holding the two construction panels in the pair of pockets; and the second sealing member is configured to engage with the elastically deformable gasket via press-fitting the rib into the U- or V-shaped space of the elastically deformable gasket so as to hold the elastically deformable gasket in place while creating a tight-seal therebetween.