Hello Everyone, Elsie Wolfe here.
I know I have gone through how best to measure windows before. To a certain degree there is a huge overlap with that and what I am about to guide you through in order to measure up for blinds. I hope this will help, I found when I stuck to the following it helped immensely, to avoid forgetting a measurement and in reducing the chance of mistakes.
Reading The Tape Measure.
I know, I know. The first time someone asked me when I was training, “do you know how to use and read a tape measure ?” I rolled my eyes. seriously though, so many people think they know till they watch someone who really knows how to use a tape measure, use one.
There are lots of little tricks that I will show you in up coming blogs but this is the first with regards to recess’ , specifically for those using the lo tech tape measure and not the digital ones.
Width and drop recess. You can sit most tape measures in a rebate this way due to them have a size written on the side marking the length of the casement. take the size at the point it hits the top of the case then add the case size on. This gives you the recess without having to bend the tape measure.
If you are old school and prefer to measure this way, the measurement you take is just as the tape begins to curve. In this case 64 1/4″ . This is also the same off measuring drops for curtains to a floor level. I measure in inches because some of the windows I measure are quite large so reading the cm/mm would be practically impossible with me stood in the middle of the tape measure.
How to measure a rebate is largely effected by the type of window we are dealing with. In this blog I am only going to focus on the following type of window when measuring for blinds.
Lets put the varying types glazing to one side, and focus on how we attack measuring for blinds in a bay once we have decided where we are fixing said blinds to begin with.
As a rule I tend to advise against using traditional style Roller blinds in bays. I have yet to see them fit neatly, function properly and not have huge gaps caused by brackets and side controls.
With this in mind lets look at how blinds fit into a splay bay windows.
- Measure the recess (corner to corner as well as top and bottom).
- Measure each angle. Top and bottom of the recess (just in case of variances).
- Measure from the top of where the blind will sit to where you want it to finish. In this case the sill. Measure at several points around the bay ( I recommend 2 for each blind).
As previously advised, please use simple line drawings and fill in the sizes. This is so much better than a list of measurements. There is also less chance on getting them wrong or mixed up. I find plan drawing helps for width sizes and a separate elevation drawing for drops is also useful.
Now you need to work out the size of the blinds that will be made.
This will be different because the projection of the blind reduces its width because of the angles.
Step By Step Guide to Sizeing Blinds in a Bay Window
Draw in the angle of the bay, then using the real sizes (Not scale), draw in the front edge position of the blind. This needs to be the rail + the thickness of the blind. (I normally allow about 1/4″ blind thickness.) In the example I have drawn it is 4cm just for the purposes of this exercise.
Draw in the front edge of where the back and side blind intersect.
Measure in aprox 1/8″ from the intersection on both sides.
Draw right angle lines back from this point to the wall.
The above has to be done for every angle where two blinds meet.
Take measurement A and – measurement B from both sides of the middle blind.
This will give you size C = the blind size.
The side blinds sit just up to the corners on the outer edge. Measure forward at a right angle then go past edge of rail aprox 1/2″. Due to the projection of the blinds and the bay there will be gapping at the side . The 1/2″ reduces this gapping. You can also have external dress curtains to hide the gaps.
Side blind is as follows. D – E + 1/2″ = F. Be aware that the rail size excludes the 1/”.
If you want a snug fit on this outside edge a batten system using an adaptor for safety from Evans means you can shape into the angle.
This then changes the workings on the side blind to ………….
D – E + distance from edge of blind to wall – 1/8″ = blind size.
Keep in mind that the back of the batten will be a different size to the front (blind size).
The 1/4″ and 1/8″ allowances are to stop / reduce the blinds from rubbing as well as helping them to fold up properly and so the gaps are not too big.
Always size the blinds using the shortest and narrowest sizes obtained.
Use the shortest drop for the blind drop but do not take anything off that size. The blind will naturally spring up slightly.
Finished blind positions.
Some bay windows have frames or mullions that allow the blinds to sit within a rebate and not interfere with each other. These are just worked out using the recess sizes of each separate area. A 1/4″ off the width size needs to be deducted so the blind does not rub. It can be a real feature having the frame, framing the blinds.
Kelly White @ www.facebook.com/whitewolfeint
Swaffer fabric and Evans rails were used in the above design.
I hope you have found this post helpful / informative. I plan to write additional posts about blinds in other types of windows so keep your eyes peeled ?
Thank you for reading.