The oxygen tension is already lower yet you're wearing a mask which will impair your ability to clear your eustachian tubes, circulate and humidify the air in your nasal passages.

Upstairs bath floors use Schluter Waterproof Membrane before tiling or flooring. 

But nobody's going to be actively coughing and spitting in your face outside a healthcare facility, and if you're not wearing a full-face respirator, goggles, or a face shield to keep sprayed droplets from getting in your eyes' mucous membranes, you're screwed anyway.

There were 2 courses of action recommended.OPTION 1:> 100% Line replacement and Water proof:> - To dig up both sides of house for gravel instal> - Water Proof both sides of home where water is intruding> -Replace storm drain lines needed on both sides of home> - cover and repitch top side to ensure proper flow away from home>> All Labor, Material, tax $13,255Option 2:> Repair Line, Jett, Repitch:>> -To dig 6ft of Stormdrain> - Repair Storm drain line where broken> -Jett lines to help clear buildup/ debris causing water to sit> -Cover and Repitch ground on driveway side of house>> All Labor, Material, Tax $2700I chose option 2, with the idea of potentially using internal membrane afterwards to thwart risk of any more water intrusion.

There were 2 courses of action recommended.OPTION 1:> 100% Line replacement and Water proof:> - To dig up both sides of house for gravel instal> - Water Proof both sides of home where water is intruding> -Replace storm drain lines needed on both sides of home> - cover and repitch top side to ensure proper flow away from home>> All Labor, Material, tax $13,255Option 2:> Repair Line, Jett, Repitch:>> -To dig 6ft of Stormdrain> - Repair Storm drain line where broken> -Jett lines to help clear buildup/ debris causing water to sit> -Cover and Repitch ground on driveway side of house>> All Labor, Material, Tax $2700I chose option 2, with the idea of potentially using internal membrane afterwards to thwart risk of any more water intrusion.

I highly recommend a decoupling membrane, like Ditra.

We've had to re-sheath an entire house because the  particle board membrane could be pierced by poking your finger through it.3.) 

I can tell you on this property that it is older and the roof was replaced about 25 years ago, membrane.

Backerboard, lap the membrane, and install all white tile above the bull nose.

@Lou Ruggieri,alternative thinking:-clean basement floor to perfection-waterproof membrane/ couple layers of exterior grade paint (encapsulate any asbestos dust)-exterior grade carpet : because you are up north/cold floors; if flooded, can be taken out, disinfected and hosed out, dried out, replace backalternative thinkhing2:-clean basement floor to perfection-waterproof membrane/ couple layers of exterior grade paint (encapsulate any asbestos dust)-treated 1x1 (as "ribs"/"joists")-lay exterior grade plywood/ost on top of it-floating floor on top of that: preferred here is Allure LVP from home depot, but many available from reputable manufacturers; probably floor needs to be rated for under grade/basementsortile everything and provide rugs + non-slip underpads