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I am planning to install Pergo laminate floor. When I look up on installation guide, it recommends to use transition molding for doorways less than 4 ft or room larger than 40 ft.

My question is that is it necessary to really use transition molding on each doorway ?

My house got standard size room doors and they are all less than 4 ft. My master room has 3 doors. I don't want to install transition molding everywhere. Can I leave more expansion gap around the perimeter to avoid transition molding? They claim to void the warranty though if I don't follow the installation guide.

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    The transition allows the floor to float and not buckle if you connect 2 rooms and have a solid connection at the doorway you might find the flooring buckling at this point so putting a transition in keeps this from happening. – Ed Beal Jun 19 '18 at 8:47
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Pergo want to absolve themselves of as much liability as possible, so they require expansion joints at all room connections. Obviously this isn't always necessary to prevent movement issues.

You'll have to make a risk judgement. Do you want to absolutely prevent buckling and shifting issues and leave Pergo's warranty intact? If so, follow Pergo's guide. Or are you willing to accept liability for repairs of any movement issues as a compromise for nicer aesthetics? If so, read on....

I would obey the 40 foot rule. That is, if you're connecting two rooms whose combined width doesn't exceed 40 feet, run the flooring straight through. If it does, install a transition with the required gaps. Connected closets don't really need transitions, for example. This should leave you with far fewer transitions than Pergo calls for, but confidence that you won't have movement issues.

Should you find that you do have movement issues, you can always cut in new transitions as needed. The mounting channel for Pergo's T moldings can be installed after the fact and the molding set in place.

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