Having a patio put in and the guys hit a root on a 30-40' tree located about 10' away. How should they proceed to cover the root and what damage might occur to the tree?
Need to include a picture to identify what tree you have. To ruin just one big root should be no worry. If your patio is concrete then we need to know type of tree and whether that tree needs for pH. Concrete use for foundations, walkways, patios greatly influences soil pH. If you send pictures we could help do some pruning to balance the root damage. How long have you had this tree? (Maybe this should be a comment, not an 'answer'...), take pictures of patio, environment and tree all together, close ups of base of tree, close ups of leaves, buds, bark...is there lawn around this tree? Is there a cleared circle of lawn, weeds, plants around the base of the tree, what are you using for mulch? Fertilizer?