DuncanAndrews

Hi I would like to sanity check my structural engineer's design to see if his designs are over engineered. To set the scene, it's a small bungalow approx 46 sqm. We are wanting to do a loft conversion that has Velux style windows only (no dormer) I would like comments on the below specifications: 1. The new floor joists for the loft conversion are 75 x 195mm at 40 centres 2. The trimmers for the staircase have been set at 3 x 47x195 (So 141mm in width). The three timbers are bolted together with M20 bolts. 3. The noggins between the new floor joists have been set as 3 x 47x195 (So 141mm in width). These noggins will then support a stud wall (38 x 140mm) to support the roof. 4. 152 x 152 Steel Ridge Beam 5. For each Velux window (780 x 1180mm), triple rafters each side of the window have been specified. So for 4 windows, 24 rafters have been specified. Just wanted to check if this looks ok or seems over engineered. Many Thanks