Prepping concrete threshhold

Is this possible? My wife wants to put a cat door in a fiberglass door into our basement that I installed last year. Do you have to do anything special for this sort of install?

Hello All - I've been DIY'ing - out of financial necessity and enjoyment - forever and can't believe I'm only now finding this forum. Just wow, the Internet constantly amazes me how many generous people there are in the world. The question: I'm looking to DIY replacement windows and trying to decide between new construction and replacement windows (sometimes called "pocket", but basically fit inside existing frames). I plan to still get mid/high quality windows with low e-glass, 2 or 3 pane, gas filled, etc. Some other research (Reddit has a few great threads on this) tells me that the mid-higher lines of Crestline (Menard's) and Reliabilt (Lowe's) are both solid choices....but brand is less important than install and trim process. Background details: Two story home built 1993 in Ohio. 24-25 windows I think, all but a few of existing windows are single-hung Acorn brand metal frame (aluminum I think). House has newer, insulated vinyl siding so residing it not in consideration. Windows on front of house have wood trim as perimeter and vinyl siding butting up to that. Windows on sides and rear have vinyl J-channel butting right up against (and caulked to) side of window). My thinking on New Construction windows: Pros: By far the biggest for me is not messing with exterior trim wrap. Works for all but 2-3 windows. Can be positive about good seals to house wrap. Cheaper per unit generally. Could even build up rough opening to fit a stock (cheaper) window size. I have all the skills, tools, experience here - but more work per window and I really HATE heights. Cons: working from exterior of home involves heights and complexity for 2nd story. Longer and more work per window with sealing and trim reinstall, paint, caulk. My thinking on Replacement Windows Pros: Faster, install from inside, generally find more higher end window options on replacements Cons: Never worked with trim wrap (vinyl coated alumnium) and would have to fashion a DIY brake to mold it. Not positive of size needed and condition of existing window frame. Unsure how/where to caulk everything to maintain water tight to building envolpe AND trim wrap. Acorn metal frame single hung windows are supposedly tough to remove, could be a rough sawzall around the edge. Bottom line: I'd love to do Replacement Windows, but how & where to do the aluminum wrapping is giving me a lot of pause. New Construction I know I can do, but will hate the heights and it's a much slower/longer process with all the extra work of cutting back siding, new j channels, and new wood trim. Skills and tools: I would say I'm somewhere between a weekend warrior and a low-end professional in terms of skills. I've installed about 5 rooms/showers/backsplashes worth of ceramic tile, built decks/fences/swingsets, built-in shelves, relocated a laundry room including all mechanicals. All that is probably nothing for this forum, but what I'm trying to say is intermediate DIY skills are covered between myself/brother/dad. Thanks to anyone who can offer anything - especially about exterior trim wrap for replacements!!! [attach]104287[/attach] [attach]104288[/attach] [attach]104289[/attach]