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Author Topic: storm window install calls for no caulk on bottom - defeats sound control?  (Read 2510 times)


  • Guest

Dear Members,

I seek a further reduction in freight train sound. Tracks are about 1/4 mile away. I am getting quotes to purchase new windows. There is a huge ($800/window) difference in price to go from one vendor with an OITC of 27 (2x and 3x glass with 1" space) to next vendor with an OITC of 34 so I am looking at sticking with the OITC of 27 and then beefing up windows that face the tracks with an exterior flush mounted storm. I like the exterior storm that I can get with 1/4" laminated glass, but I suspect the recommended installation (blindstop with caulk on top and sides - no blind stop or caulk on bottom) would allow significant sound to leak through. The attached picture shows that the brick bottom sill is sloped so sound traveling in a straight line would hit the brick. Since I don't understand sound transmission, I am hoping to hear back on the whether I should give up on the exterior storm for sound control and go to an interior storm or something else entirely. I am in E. TN.

Thank you,

Randy S

  • Guest

how much sill space do you have on the inside?

Randy S.


  • Guest

There's just over an inch on the inside after taking into account the sash handle. The link would be for an interior fix - I was thinking the best results would be to position the extra glass as an exterior storm - I am just not sure how much sound would go underneath the storm if there's not a blind-stop for the flush mount and caulk underneath the exterior storm. The install instructions say this is necessary to let water that gets past the storm to leak back out and reduce condensation.