Building a Pediment - Master Carpentry

we are going to complete our classical fireplace mantel build so if you've been following this thing from the beginning I salute you cuz this has been a [Music] journey [Music] and the last video in this journey was installing our triglyphs on our freeze so moving up the build the next thing to do is our cornice so the cornice I didn't really go into a whole lot of detail on the bed mold in the corona because if you followed you know on the mantle shelf top we went through this whole thing in depth and detail and exactly what's happening on the Shelf top is happening above the freeze the cornice is just repeating so like I mentioned the last thing we left off with was installing these trips on our freeze and let's just do a quick like refresh so this whole thing that we're building up here is called an inure and how that breaks down is you have this molding which is an architrave freeze is this section and then cornice up here which is not complete our cornice this section that breaks down even further we have this bed mold that's a supporting molding notice that shape right there it's like showing strength and lifting it up that's that profile there and then we have our Corona which consists of a sofit underneath and a faal and then we have our Sima what most people know as a crown molding and we're using a pretty standard profile and if you look at this profile you'll notice that it has a Cove at the bottom of it in classical architecture here's what happens this Sima molding does not wrap around the front when building a pediment which is what we're doing so here's what happens in the pediment it's going to rake up at 22 1/ 12° and it will split that bottom Cove right there this is what it's called a split fillet so what I need to do is I need to rip that molding off on the table saw that Cove profile at the bottom of this molding and let it go across run across the face and the crown part of it will only connect on the side when it wraps back into the wall and on the pediment when it goes up at 22 1/ 12° so I have all of my pieces now pre-assembled for the outside corners for this little Cove profile and I can just get them installed right on top of that fascia there so long as I'm lined up where the primer meets that raw wood that's exactly where it needs to be at this point as you can see we have that little Cove bottom profile of our Crown installed around the entire build now the next thing I need to do is cut my board that will be the actual ual pediment so this board is what my moldings in the pediment will attach to they're going to be installed directly to this so I determined the math I'm not going to get into it but I'm cutting this board to the correct length and width ripping it on the table saw there and then I'm finding center of this board so once I find Center of this board I can then take a straight edge from that center line all the way to the other side but coming down at an angle and I know that that shape right there is the exact size pediment and angle that I need on my pediment so I will go ahead and cut this out on the track saww I'll get it set up actually and then I'm letting my son Levi cut it out it's actually really funny to see him holding this big ts75 that is just the size of him it's pretty crazy this is like the biggest track saw like standard track saw on the market so it's just kind of funny to see him holding it so we have our pediment board here and then we have these two offcuts we ripped this down on the track saw earlier and I got lucky and realized I could use these two offcuts right here as spacers so I can put these in here these don't have to be perfect and I can get these installed these are a little undersized but it's not going to matter cuz essentially what I'm doing is I'm using these as a spacer yes but also as something to shoot my final piece into that's in my blocking that I have here I know since I constructed this whole wall that I have substantial blocking all in this area specifically for this task so what I can do now I can go up and look I just have to split the difference on where this is and then I can install that right there with my spacer in I can now take my actual pediment piece and install it now this one I do have to make sure that it's on all my indication marks so I like it right there just checking this that looks good to [Applause] me now with this pediment board in we can begin the molding installation process on it and the first thing we're going to do is find that single cut angle using the stair at miter finder so I'll dial this in by keeping it flush on the bottom and then flushing it up with that angle and if you look at the single cut indicator here it's given me a reading of about 77° which is not something any mitol can do without some kind of special jig now thankfully I have a special jig it's called the Kaizen miter fence and it comes with this extreme angle jig I'm using the one in Wood there's an aluminum one that's adjustable as well that you could use but I chose to use this one made out of wood because I'm screwing this molding to it from the back so you can see here it's propped up in the position that will be installed and it would just be really hard for me to hold that in that position another thing I want to note here this is a large cut going through this thick popler uh popler is a softwood but it's just the angle that it you want it to be precise so I'm just taking my time and you're seeing that cut in real time it takes a while to get through that if you want a clean cut so you can see me unscrewing it here and that's where it was held up but look at the angle of this cut that is a sharp angle there but using this process I was able to get it to fit like a glove you can see me drop it in here locks into our pediment board and then sits flush on top I left this a little bit long because I need to cut the peak miter on it up here and I can determine that miter with the stare at miter finder looking at the miter cut indicator this time and I came up at 12 half de here so I'll set up in position here against the fence 12 1/2 de miter cut straight through it and of course I'm going to repeat this process for the other side same thing with my extreme angle cut and for the miter up top so once I have both of these boards cut to size I can then take them up and set them in place and just do a dry fit and what you're not going to see here is I actually screwed these in from the back into that pediment board with trim head screws so fits perfect and then I already screwed them in by this point next I'm going to install my S board which my facial will be nailed into and these next two components I had to use the extreme angle on them as well because they're all coming in at that same angle I'm not going to show all of that because it's again it's the exact same process I screwed it to the extreme angle and um did that same Peak miter cut and you can see the results I'm getting here where it meets the uh existing cornice that is just too clean so here comes the fascia and for the fascia I have a Cove milled into the bottom of it so as long as that Cove is lined up with the beginning of the sopit you'll remember this from the mantle shelf top as well I know that's exactly where I need to be so I held that in position when I marked it off for these Peak miters as well so here I'm just gluing the joint and getting that shot in place and installed and I'm like at this point I'm looking at this thing and I'm like wow dude you might actually pull this off so once again we meet here at this corner a little bit different situation obviously because now we have our pediment built up so here's the real technical part of building a pediment that is extremely difficult to get right but we've done it so check it out this piece right here this is that same Cove profile that we ripped off the bottom of the crown and wraps around the front we talked about this at the beginning of the video that continues to go remember that's the bottom profile of that Crown I want to I want to highlight that fact because here's what's going to happen that same angle right here that 77° angle that all these have been we're going to cut that same Cove profile to meet up with itself right here at this corner at 77° and you can see I've got this piece already cut I cut it the same way using that Kaizen uh extreme angle jig and you can see it matches up perfectly right there so that is amazing how that works out and the detail is really this corner how this just dies into the same profile this is true classical architectural detail right here this is how it was designed how it's meant to be the proper way so here's the next question okay you've got that accomplished how do you what do you do with the top profile of the crown this is only the bottom how are you going to get that Crown to turn up well the same way I ripped this off on the table saw I'm going to rip off that top profile of that crown molding and this time I'm going to not I'm not going to rip it the exact same way I ripped this one I'm going to rip it so that I have the majority of that top profile so with this in position here I've got a little sample glued up of that top profile of that Crown ripoff and this will just sit right in here guys and I've got a little bit of a lip on top that I can lock that into but that is how that's going to go right there and that is what we call a split fillet so remember what I talked about the crown is wrapping back into the wall this way and then it's raking up up the pediment so I've taken this put it in position and I now have my Peak miter cut on the end so I have a little indication Mark here as well where I want them to be to meet up just little pencil line connecting them so with it in position right there I'm going to come down on it with my little pin nailer here give it a few pins and then you can see I've got some left over here that's so I can push the crown up against it and automatically stops it I didn't really think this through on this side so I probably will add another strip there so that when I bring that top part of the crown profile it'll just lock into place but it's built into this one meaning as I shoot this up I need to keep it at that same reveal [Applause] now when we come here these two will kind of set theirself in place like that but I'll put some glue this split fillet detail right here has got to be top five most interesting carpentry task I've ever accomplished to see that cornice pivot up on that point is really mind-blowing to me so that is the bottom piece of that Crown profile like I keep saying and I want to emphasize that again because we still have our top piece remember I showed this earlier and the interesting thing about this because we split this in two with this top piece and this bottom piece I don't have any weird miter or any crazy cut here this is literally just a 45° cut but it's going to tilt built up so I'll measure from this back wall get that cut then I'll leave it long like I've been doing for all these raking pieces I'll put it in position here and then I'll mark it off up there and put it in like it's literally that easy you're just taking a 45 it's pivoting on here and going up that's it we have our preassembled full piece here again just a 45 that's going to be tilting on our angle so I'll get it in position and you're good over there on my line [Music] right there we go I'm going to leave yours loose a little bit cuz I want to match it up and glue it looking good man all right guys this has been a long journey but it finally commences right here I have completed my classical fireplace mantel piece right here behind me and the whole point of this really was you know I I thought about going to Greece and you know doing all this stuff and I was like you know what why don't I save money on travel save money on planes all that hotels accommodations and just bring grease to my living room like that makes so much more sense than I can enjoy it every day we have an actual greek temple front mantle with triglyphs with a double cross- seted corner with this cross- seted corner mantle piece down here with the brackets with this small ways Scott pedestal pencil molding you know everything if you followed along my highlight of this was literally what we just did in this video and that was that split fill on the raking cornice the single hardest part about this was calculations where is stuff going to fall when you when you have this Vision in your mind of what we see here how are things going to lay out that was so crazy I don't know how many like literal hours I just spent just like this just like looking at it for each component all right if I put this here how is that going to line up here and what's that going to do as we make our way up and you can see every single detail was accounted for I mean the size of the Samsung frame TV fitting perfect in there the sconces the lights themselves are centered right with the TV everything if you look at you'll you'll find regulating lines up this whole thing um it was it was that that was the most difficult it wasn't really the carpentry minus what we did today with that split fillet that was pretty intense the hard part for me was playing designer architect on this build right here not so nobody handed me plans and said here build this this all came out of my mind with inspiration from books inspiration from uh just the images that I've seen and it commenced all right here so that was a long speech but I really feel like this is the highlight of anything I've ever completed so thank you so much for following along with it I know some of you are probably like good we're ready to move on to the next thing I am too but I did have to complete this and finish it and put it out there so yes we'll be getting into some more videos job site videos some more stuff around the house but again thank you for watching following along um this is the fireplace mantle piece complete see you next time I had a dream that you came to me sharing down through the clouds like a moon beam here you [Music] were

Channel: Finish Carpentry TV

Views: 58,605

Keywords: finish, carpentry, finishcarpentry, trim, work, trimwork

Id: iyMJqYwDSBw

Length: 18min 14sec (1094 seconds)

Published: Tue Mar 26 2024