I installed a new garage door and, consistent with the direction, ensured it was level by shimming one side. However, now one side has about a 0.25 to 0.5 inch gap when the doord closes with the electric opener (this is the best the gap gets after lots of adjusting). I need to level the floor under the door. I need to put a wedge of concrete (or similar material) in that is 4 to 5 feet long, 1 foot wide and tapers from about 3/4 inch to nothing. The existing floor is concrete (part of the slab) and will be outside the garage where it extends beyond the door (all but the thickness of the door). Is there a way to do this without ending up with concerete (or similar) that cracks or flakes away from the original surface?

My house has 13" solid walls. There is damp (in patches) in the back rooms (upstairs and downstairs) which extends about 2 feet from the (northeast) corner. The walls have been repointed and the outside painted with masonry sealant, then 3 coats of masonry paint. It has also had Liquid damp proof course injected. A dampmeter goes into the red in several places, yet about a foot away there is no damp reading at all. The wall at this point is unsheltered from the weather by other buildings. But I can not see where the water can be getting in or why the damp is so isolated. The wallpaper has lifted in that general area but is firm in the rest of each room.