Installing Contemporary Metal Trim and Siding with Continuous Exterior Insulation

[@littlered6780]

Hello Chris, very detailed presentation. Though I do need two areas clarified. When installing the top plate exterior J channel, does it fit snug against the soffit? If so will it interfere with the core vent being able to exhaust/breath? If so how do you deal with this area? Question 2: Knowing that there's 4 inches of RW and you use the recess window look with a inverted corner piece with opposing J channel corners trimming out the window and panel extension jambs... How is the ext jamb panel pieces attached?

[@OHSCrifle]

Pretty cool Chris. Any concern about the horizontal furring (corners) blocking your rain screen cladding vent plane? I need to come see this.

[@LGSquared]

Hey, Scott. Behind the lap and panel siding, the horizontal 1x4s are only at the corners, which represents a small percentage of the entire assembly, and the area between horizontals is connected to the vertical spaces. So, in terms of ventilation, there is more than enough. 3/4" is about 2-3 times as much space than is needed, anyway. So, we have a surplus. If bulk water somehow gets into the assembly near the corners, the vapor openness of the insulation and the gaps left between the furring strips and cladding allow for moisture to exit the assembly, but it's VERY unlikely that bulk water will ever get behind the cladding for it to be a concern. The concern will primarily be humidity, and that will dry inward or outward, depending on the energy flow (hot to cold, summer/winter, etc.). This and ventilation are the primary concerns in a closed joint rain screen assembly. For the vertically oriented cladding system (Trespa Pura) on the front of the house, it attached to the wall using clips that are secured to the 1x4s, leaving a 1/8" gap between the back of the cladding and the furring strips, throughout the assembly. Both ventilation and drainage happen in that gap, which is adequate, but also the insulation is vapor open and provides additional drainage capacity. Either way, the assembly stays very dry because of its design and an appropriate vapor openness of each layer.