[Greenbuilding] Ridge Vent on Corugated Metal Roof

[Lynelle A. Hamilton]

This is the one I have on the current house, garage and shed and I like it.

Lynelle
On 5/12/2014 8:40 AM, Frank Tettemer wrote:
> Hi Eli,
>
> Here's my favoriteridge vent system. Used it for fifteen years now, 
> when appropriate to the build.
> Maximum venting area, with three inches left open, between the 
> topedges of steel roofing, at the top ofboth roofs.
> These come in a box, in ten foot lengths. Steel construction, very 
> sturdy, with the attic ventilation exhaust vent installed with innner 
> mosquito/fly/wasp screens.
> Combined with soffit venting, the attic space stays cool.
>
> http://www.vicwest.com/sites/default/files/Vicwest_E_Roofing_Book_1.pdf
> Page 7 of this installation manual has the venting drawings.
>
> Frank Tettemer
> Living Sol ~ Building and Design
> www.livingsol.com
> 613 756 3884
>
>
>
> On 12/05/2014 8:02 AM, conservationarchitect at rockbridge.net wrote:
>> Hi List
>>
>> Fishing again for great ideas from our list.  I have a gable end roof 
>> framed with truss's at 4'oc with 2x4 purlins at 1'oc.  I am planning 
>> on installing Fabral Grandrib 3 corrugated prefinished metal 
>> roofing.  It is a simple roof with no hips or valleys. The top chord 
>> overhangs the wall and are left exposed with a 2x fascia installed to 
>> keep them from twisting at the end. The truss has a vertical raised 
>> heel at the end sufficient for additional cellulose over the 8" eps 
>> foam that runs below the bottom chord. I am also installing a 
>> continuous soffit vent installed vertically just below the top chord 
>> and above the cellulose.
>>
>> My plan is to install a ridge vent.  I like the grand rib, because 
>> the profile of the ribs offers significant free space so that boient 
>> driven air flow has a vertical path to follow to the ridge.  One 
>> contractor describe his ridge vent using a ridge cap over foam rubber 
>> compressible material that can work around the shape of the ridges.  
>> My concern is that this foam rubber may reduce the free space I would 
>> like for encouraging the air-vapor flow.
>>
>> I have thoughts of adding blocking and a screen to lift up the ridge 
>> cap (standard or fabricated) to greatly increase the free space.  The 
>> roof pitch is 9/12.  Therefore, I would expect a decent amount of 
>> overlap (4"-6"?)over the top edge of the corrugated roof will 
>> protect  the roof from wind driven rain driven water.  I could also 
>> get my installer to turn the top edge up to block flow going up hill.
>>
>> I hope people on our list are willing to share your ideas for ridge 
>> vents over corrugated metal roofs.  I am sure they are out there.
>>
>> Thanks in advance.
>>
>> Eli
>>
>>
>> _______________________________________________
>> Greenbuilding mailing list
>> to Send a Message to the list, use the email address
>> Greenbuilding at bioenergylists.org
>>
>> to UNSUBSCRIBE or Change your List Settings use the web page
>> http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org 
>>
>>
>


---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com