Hi, I'm planning to attach the 5m aluminium ledger board of the pergola (105x50 profile) to the house. To be specific, the house is a timber frame with high density polystyrene foam infill for insulation. There is textured rendure over the top of this.
I plan to use stainless steel M12 bolts to affix the ledger board to the house's solid timber wall plate. The thickness of the plate and foam is near 250mm not including the plasterboard on the inside.
I need to seal the gap between the facia of the house and the top of the powder coated aluminium ledger board. It's an open pergola (no roof) but water could penetrate the bolt holes or create staining on the facia when dirt and dust is washed down. How best to seal this ? With flashing or sealant ? If flashing ... what type? An adhesive type?
I have one question regarding the affixing of the pergola ledger to the facia. Is it OK to flush mount them or do I need to use a packer or stand-off between the two to do so? I'm not sure if there's "best building practice" or building regs that suggest otherwise.
Thanx in anticipation of any assistance or advice.
