Contractor Talk - Professional Construction and Remodeling Forum banner
Cancel
Create thread New Forums

Help with window sills

Jump to Latest
1 - 20 of 33 Posts

Stunt Carpenter

· Registered
Joined
·
3,217 Posts
Discussion starter · #1 ·
I have a project coming up and I'm not 100% sure the best was to duplicate what's was original.

This is what is original and rotted out



I plan on using Smart Board to replace all the trim.

What I'm insure about is the best way to make the sill on the bottom. They have the most rot and I think it's because they have now slope.

My thoughts are to laminate two pieces of the trim and make a drip cut on the bottom but I'm unsure if this I the best approach

Thanks in advance for any help
 
#2 ·
If no one responds, I'll send you a shop drawing of a bull sill nose from one of my window suppliers, tomorrow when I get to my office. All you need to do is set your table saw and run the Smart Board through the table saw to angle everything up correctly.
 
Discussion starter · #3 ·
CompleteW&D said:
If no one responds, I'll send you a shop drawing of a bull sill nose from one of my window suppliers, tomorrow when I get to my office. All you need to do is set your table saw and run the Smart Board through the table saw to angle everything up correctly.
Click to expand...
Thanks. How many degrees would you recommend
 
#6 ·
Stunt Carpenter said:
That's way more than I thought. I was thinking 5 degs
Click to expand...
That could be just fine. I need to look once I get into the office in the morning. I just don't remember what a standard sill nose is, sorry. :blink: But any slope at all, is better than a flat sill obviously.
 
#7 · (Edited)

Attachments

#10 ·
hdavis said:
Old wood window sills run pretty close to 12-14 degrees - it's just what has been found to be best. 5 degrees will still get you shedding.
Click to expand...
Yup.... that's what I thought last night when I "guessed" and posted 10-15 degrees.

I just checked, here is a recommendation for a window sill or sill....

"Having an accurate window sill angle measurement ensures tight fit with windows and more importantly, minimizes water infiltration via wicking.

So what is the correct angle for a sill? In general, a window sill should have 3-12 or 3″ by 12″ slope or pitch for good rain drainage. 3-12 slope means that for every 12 inches of horizontal distance (run), the vertical measurement (rise) is 3″.

This corresponds to 14 degrees of slope."

Hope this helps.
 
Discussion starter · #11 ·
CompleteW&D said:
Yup.... that's what I thought last night when I "guessed" and posted 10-15 degrees.

I just checked, here is a recommendation for a window sill or sill....

"Having an accurate window sill angle measurement ensures tight fit with windows and more importantly, minimizes water infiltration via wicking.

So what is the correct angle for a sill? In general, a window sill should have 3-12 or 3″ by 12″ slope or pitch for good rain drainage. 3-12 slope means that for every 12 inches of horizontal distance (run), the vertical measurement (rise) is 3″.

This corresponds to 14 degrees of slope."

Hope this helps.
Click to expand...
Ya. Just to clarify that's is for the trim sill piece and not the rough sill?
 
#19 ·
hdavis said:
Old wood window sills run pretty close to 12-14 degrees - it's just what has been found to be best. 5 degrees will still get you shedding.
Click to expand...
Every sub-sill in the whole city here, 90-120 year old buildings, is running at 2-4 degrees.
 
#20 ·
Most of my sill nosing and trim today is Wolf PVC.

My sill profile for this stucco application was rabbeted to go over the stucco with drip relief and pitched between 13 and 15 degrees.

I wouldn't pitch my sills any less :no:
 

Attachments

1 - 20 of 33 Posts
About this Discussion
32 Replies
12 Participants
Last post:
Millar
Contractor Talk - Professional Construction and Remodeling Forum
posts
3.6M
members
169K
Since
2003
A forum community dedicated to professional construction and remodeling contractors. Come join the discussion about the industry, trades, safety, projects, finishing, tools, machinery, styles, scales, reviews, accessories, classifieds, and more!
Full Forum Listing
Explore Our Forums
General Discussion Tools & Equipment Business Painting & Finish Work Decks & Fencing