Forming an opening through an insulated cavity wall


My level of competance from the scale of 1:10 is 1. Howsoever I have been unable to find an answer to my problem and I ask for help. I have been experimenting with forming an opening through a simple insulated cavity wall such as is found in many modern dwellings in England that are built down to being commonly affordable ie it could be much more complex.

This consists of:
1] Outer Brickwork Skin
2] 50mm cavity,
3] 75mm insulation
4] 140mm Blockwork inner skin

However forming openings through this specification is proving onerously impossible or nearly so. I have successfully formed and opening treating each layer as a separate entity by drawing the opening onto each face and extruding each singularly. This proves to be not easy and not accurate.

I have attempted to form the opening using solid leaf entities and a plug to pass through the wall to be negated. but that doesn’t seem to work even though each leaf and the plug are ‘Solid Groups’.

In short how do we do this please in such a way, that say, 10 doors and twenty windows are not two weeks work and that are accurately formed? HELP!



You might try the Face Cutter extension.


Trimble Sketchup 2016


I am also a UK user of SU and regularly work on buildings such as yours. Without posting the file, it is difficult to know what you are doing wrong.

Firstly, much depends on whether you are working in 2D or 3D.

Secondly, much depends on whether you have grouped elements or not. If you haven’t, get used to doing so right now because you cannot really use SU without learning to group. It sounds like you may be using layers where you should be using groups.

If you are working in 3D and are trying to create an opening, the usual method is to draw a rectangle on the elevation corresponding to your opening and then use Push-Pull to cut it through the wall. If each part of your wall is a separate group, you will have to do it for each element.

Your comment about a “plug” suggests you might be creating a cutting entity and then trying to use Solid Tools to do the cutting. You could do it like that but it would be very long-winded. Also, you often find you don’t have a proper solid to work with in the first place and have to fix it first.

Hope this helps.


Neil I will down load that add-in in the morning, many thanks. I off to bed right now.

Thanks for your reply I’ll let you know how I get on,

Chris S


I appreciate all that and given that the wall detail is of the sort found before and after the 2nd world war it is simple and almost as fast as a simple push pull single leaf door or window opening, but given the more normal modern day wall detail it appears to be very difficult. If you commit to making your leaves solid and then your plug solid and then negating one form the other SU., simply shouts at you with a message box stating only two entities cane be negated from and as you know the modern wall is at least three leaves many of us like to use 4; then old fashioned drawing/copying/transferring a rectangle on to subsequent faces becomes not only difficult but far from spot on in accuracy. What I want to know from you or another of Sketchup’s highly experienced SketchUp users is a quick, easy and accurate method of cutting many doors and windows of many differing sizes. May be we can pre-empt the cutting of walls by inserting the door and or window object/entity ‘a per pro’ floor and ceiling joists before raising the leaves but then presumably that entity would also require a solid lining to make all other detail build around; perhaps I should experiment with that notion.

Help required please,


Fredo’s Visuhole is one of the best options once you know how to do it manually.


I do also have MAKE from long ago.


Hold on, why are you using old software? It is bad enough that you seem to be using SU Lite in a professional environment but why on earth not use current free software?

I take it you have a reason not to post the file?


How you know which SketchUp I am using beats me. Howsoever; to put the case straight I am using:
SketchUp Pro 2016 Version 16.0.19911. I do understand solids, not all their vagaries I admit, but most are apperrant to me and guarded against from the outset whether I think I will need solid objects or not.
Yes I do have much earlier SketchUp’s & Make that may be being recognised from some source but I use neither in practise.
They just happen to be present on my machines.
Incidentally I have now found an architectural bolt on that allows me to punch through the 4 leaves [ 1 void ] in question with which I have carried out just one successful operation, that program being ‘1.1001 Bit Tools’. This concludes my search/research. Box’s program still alludes me although I have visited the ‘Visuhole.1’ web site.



You’ve left me speechless on both forums that I’m aware of your posts on.


Chris, I think this must be a language issue. I’m guessing English maybe isn’t your native tongue? You said [quote=“ChrisSpreckley, post:10, topic:32821, full:true”]
I do also have MAKE from long ago.
[/quote] which led me to suppose that is what you were using currently.

Anyway, fantastic that you have found a solution.


Please update your forum profile. It currently says “Google SketchUp” which will cause people to think you are using an old version since Google sold SketchUp to Trimble over 4 years ago!


If I new how to do that I would. This forums instruction is to say the least, unintuitive.


Click the in the upper right corner of the browser window, then click the . You will open a preferences page. Scroll down and edit the fields for your Graphic Card, Operating System, and version of SketchUp. Please be specific about the version, e.g. 2016 Pro as noted in the prompt under the field. Then update your profile using “Save Changes” button near the top of the page.


Done. Thanks and cheers,
Chris S.


Well, almost done …

Gigabyte isn’t a full description of the graphic card - what’s the model number and memory?

And Sketchup hasn’t been Google for nearly five years now - not since SU 8 which preceded Trimble’s 2013 version.