Could someone please help me understand a few things?
1. I’ve read that temporary downpipes should be installed as soon as the roof is up. Is there some law that states this or is it just good practice/common sense (that is clearly uncommon!) to protect the slab?
2. How is the slab protected up to the point that the temporary downpipes are supposed to be installed? Is it purely via the grading of the land away from the slab?
3. Lets assume it took a volume builder 8 months to build a house and they didn’t use temporary downpipes. Any idea roughly how long it would have taken between the time the roof went up and the official downpipes were installed? ie. roughly how long would the slab have been exposed to rain if no temporary downpipes were used?
4. Lastly, how much rain fall per month is an issue when it comes to building a house that has poor slope away from it and no temporary downpipes? The house is on very highly reactive clay.