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Discussion Starter #1
I've got a client that wants the roof rebuilt on her pergola. She is adamant about me using plastic lattice (because of the limited maintenance). I know what every mfg has to say about this- don't do it.

Have any of you "successfully" installed lattice horizontally?

Side note: she does want it in white- figured I'd mention that as there would be less heat retention and potentially less sagging.

Anyway, any help would be appreciated. Thanks!
 

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Rafter spacing?
I can't imagine this working.

Pergola roof lattice has been Cedar/Redwood 1x2 or 2x2.
 

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Discussion Starter #3
Well, the rafter's will be part of the roof replacement, so I'm open to spacing. I was thinking approx 18" to 24" spacing. Anything closer and it'll start to look heavy.

I thought of basically two ways to install the lattice.
1. Simply lay 4x8 sheets across the top
2. Install 1x2 runners the length of the rafter and recess lattice panels between rafters.
 

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I have never done pvc lattice horizontally, but when doing it on the vertical, the 1x2 adds some stiffness.
 

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Lattice on top of a pergola is a mistake imo. White will show the dirt big time, the plastic has little strength & will sag between the rafters in no time. I would suggest to her to use man made 1x2's or 2x2's on top instead.
 

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Discussion Starter #8 (Edited)
Lattice on top of a pergola is a mistake imo. White will show the dirt big time, the plastic has little strength & will sag between the rafters in no time. I would suggest to her to use man made 1x2's or 2x2's on top instead.
Well, the dirt will be on top and out of sight but I do agree about the sagging. Seems like no matter what I space the rafters at I run the risk of sagging, drooping, warpage... whatever. Probably the reason why every manufacturer warns in bold lettering to not install horizontally.

You mentioned "man made" 2x2's. Are you referring to decking composites?
 

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You mentioned "man made" 2x2's. Are you referring to decking composites?
Yes, man made decking is made to span 16" centers so it can be used on top of the rafters for less maintenance. I can remember seeing trex or some other company's product in my suppliers yard that was 2x2's. If they don't make the 2x2's anymore I believe they still make 2x4's which could be ripped. Imo that would look more like a pergola than using lattice which just looks like a mistake.
 

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Pergolas

We have used plastic lattice horizontally, 12" oc rafters, and 1/2" J channel on the ends to allow for expansion and contraction. Many years ago and didn't get call backs. Some people just gotta have what they gotta have and think your scamming them if you won't do what they say.

There are a lot better products out there that will provide more shade and rain protection also. We ran into AmeriLux, actually they called me after I went to a show, either IBS or Deck Show or something like that. Their web site is:http://www.ameriluxinternational.com/ and we used their product like this:
 

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If she's adamant about using vinyl lattice as a shade structure,

2x rafters, 24" oc.
Cut into top of rafters a 2x2 notch every 24" (gang up rafters and production notch them)

*Make sure rafter is sized correctly for the span, accounting for the notches*

Drop 2x2 purlins crossways in the notches over the installed rafters.

You've now got a 2' x 2' support grid under the lattice. No sag. (or at least minimal)

Mac
 

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I'm a big fan of Lexan myself.

In fact, I have 4 sheets of 4'x12', 6mm bronze that I need to get rid of cheap. They sent me twice as much as I ordered and since it came from Wash. state and took 2 months to get everything, I wasn't about to tell them they screwed up.
 

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I'm a big fan of Lexan myself.

In fact, I have 4 sheets of 4'x12', 6mm bronze that I need to get rid of cheap. They sent me twice as much as I ordered and since it came from Wash. state and took 2 months to get everything, I wasn't about to tell them they screwed up.
Why don't you create a project for it when you sell jobs. Lot easier, get more for your money that way.
 

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Steve,

Here's an idea for guttering a roof like your display without mucking up the decorative tails -



If that didn't work, maybe this will. Not sure why I've started having such problems sharing pics from my DB account...



Mac
Am I seeing that right is the gutter notched into the rafter?
 

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Mark, were you using Sundance ?

J.
No, I go through Sabic Polymere shapes. I used to go through GE, which makes Lexan, but these guys replaced them and it has occaisionally been a pain.


Good to hear from you again Killer, you were gone for awhile. During that time I retired and no longer have any projects calling for Lexan.
 
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