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3/4 light entry doors - true divided light or simulated divided light?

4 years ago

We're buying Simpson 3/4 light double front entry doors in wood (set of two doors, each 30", for total entry opening of 60") and need to decide between TDL (true divided light) and SDL (simulated divided light). We'll be painting the doors. We understand the differences between TDL and SDL construction. We're considering the possible energy/insulating benefit of SDL, particularly since we're buying 3/4 light doors. Limiting places for air to seep through could be good. We're also considering our possible aesthetic preference -- I love the faceted appearance theoretically achievable with TDL as opposed to the flatter, uniform reflection that can result from a single sheet of glass with grilles imposed on it (SDL). We just replaced our windows with Anderson 400 TDL, but we're undecided about TDL for the front doors. I've looked into the difference between how the spacer bar between the glass in the SDL option will look versus how the TDL doors look. Anyone have first hand experience with how 3/4 light SDL entry doors look versus TDL? Would we regret choosing SDL because of the possible aesthetic concession, or will we not even notice?

Comments (12)

  • 4 years ago

    Thank you very much for your thoughts on this! We do not plan to use storm doors.

  • 4 years ago

    Update: I was wrong about our house windows. They are not TDL but FDL (full divided light), which for Andersen windows means interior and exterior permanent grilles, with an aluminum spacer bar between the glass. This seems to be the same thing as Simpson SDL. Any reason not to buy 3/4 light wood doors from Simpson that are SDL? The only other thing I've learned is that with a Simpson SDL door, if glass breaks, it may be cost-prohibitive to replace the glass, and necessary to replace the whole door. With TDL, an individual broken light can be replaced. Any thoughts on which doors will look better, and what makes the most sense? Attached are photos that show what the TDL and SDL lights look like in the Simpson doors. The light with the dark framing is the TDL and the one with the aluminum piece between the glass is the SDL.



  • 4 years ago

    Are you sure you want 30" double doors? You end up with 2 narrow doors.

  • 4 years ago

    Thank you. Yes, we need to go with 30" double doors. We are replacing the original front entry doors that are the same size. Significant renovation would be needed to change. The space doesn't work well for a single door with sidelights, for instance, which was our first choice, and we can't go wider than 60" because there's a coat closet inside on either side of the entry doors. We also can't easily go taller. We have two sets of French doors on the back of the house, each the same size as the proposed front entry doors. We are comfortable that the size of the entry doors will be nice.

  • 4 years ago

    SDL will be fine instead of the TDL.

  • 4 years ago

    Thanks very much for your thoughts.

  • PRO
    4 years ago

    I would need to see the house and all the other windows.

  • 4 years ago

    Thank you for being willing to share your thoughts. Attached are a few photos of the house, and one of the door style we're pursuing. The brown doors example may have bevelled glass, but we are not seeking bevelled glass -- I just included the photo as a sample of door type.









  • 2 years ago

    Hi, I'm wrestling with the same question now and am curious where you landed on this question and if you're happy with your decision. I lean towards SDL for energy efficiency, but it's an old house and I don't want it to look fake. Did you go with the SDL option?

  • 2 years ago

    Happy to share! We ultimately purchased Therma Tru Smooth Star doors with SDL and we’re very happy with them. I painted them Farrow and Ball Stiffkey Blue on the outside and installed an Emtek Jefferson handset. We’re working on the casing at the moment and changing the lights, and I don’t have a photo showing everything done, but the photo below at least shows the doors. Perhaps I’ll post another photo when finished if I can remember to do that. I certainly am very thankful for the help I’ve received through this site! Good luck!

  • 2 years ago

    The doors:

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