A) Contractor A bid $1,000 to fix 2 leaks, replacing 10 feet of plank wood 2 pieces, replace shingles, place plastic cement and fiber glass along the valley. 1 year warranty, $300 advance, $700 when complete.

I don’t know what to say about the insulation, except that there is fiberglass insulation in the walls.  

Opinion seems to vary between using expanding foam, and cutting strips of fiberglass insulation and putting them in there. 

His work is the type where they put excessive sub-woofers and flat screens all over show vehicles, turn a Suburban into a 2-seater with 9 feet of 47billion watts worth of subs, wrapped in flowing body-colored fiberglass with computer controlled LEDs, and make golf carts thump while they cruise car shows.

Then you have the opportunity to insulate with fiberglass or spray foam.

The $1 fiberglass filters are good for a month and the $3 pleated ones are good for 2 or 3 months. 

You can get this as a full fiberglass insert with grab bars attached. 

He put curved wood all over and inside it, did some good fiberglass custom work.

fiberglass?

Mold needs to feed on cellulose which is paper or wood. so it would not feed on caulk or a fiberglass tub insert.