(12) My roofing was comprised soft board ceiling (Ksh 800 per panel, and I used 100 panels on a 40ft x 40ft house), wooden trestles costing Ksh 130,000 and clay tiles and iron sheets costing 170,000. In Kenya, it is now standard to lay iron sheets first then place tiles on top of these for security reasons.... otherwise thieves will have an easy access to the house at night...