Posted By Jerry Lucey Hi Monica, I have experianced difficulties in basement works during construction where contractors brought their own generators etc onto site and fumes were created. In such a situation it is important to ensure that such fumes are vented directly to atmosphere. Another area to be aware of is hotworks at ground floor level close to vents from underground car parking areas. The measures implemented should prevent sparks entering the vent and basement area. Hope this answers some of your questions.